15 Best ddr5 RAMs for Server, Compared
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Finding the best ddr5 RAMs for server platforms requires matching module speeds, rank profiles, and error-correction standards to your hardware. This guide compares 15 memory kits using the specifications published on their listings.
The SK Hynix 16GB DDR4-2133 ECC Registered Server Memory leads our list because it provides registered ECC reliability with CL13 latency at DDR4-2133 speeds. This breakdown helps you select the exact module capacity, voltage, and form factor needed for your server deployment.
Quick picks
The best fit for you
- You need registered DDR4 memory with lower CL13 latency SK Hynix 16GB DDR4-2133 ECC Registered Server Memory This module provides 16GB of registered ECC capacity running at 2133MHz with CL13 latency.
- You want high capacity using DDR4 load-reduced memory SK Hynix 64GB DDR4 2400MHz ECC LRDIMM This module provides 64GB of load-reduced ECC memory running at 2400MHz with CL17 latency.
- You require 1.35V memory for a DDR3 server upgrade NEMIX RAM 32GB DDR3 1600MHz ECC LRDIMM This 32GB load-reduced ECC module runs at 1600MHz using a 1.35V operational profile.
Our 15 picks
SK Hynix 16GB DDR4-2133 ECC Registered Server Memory
Best for: DDR4 servers requiring registered ECC memory
- Compatible Device
- Server (what this guide is about)
- Capacity
- 16GB
- Memory Speed
- 2133MHz
- CAS Latency
- CL13
- ECC Support
- ECC/REG
View on Amazon: SK Hynix 16GB DDR4-2133 ECC Registered Server Memory
This SK Hynix module provides you with 16GB of DDR4 memory built for server systems. It operates at DDR4-2133 speeds with a CL13 latency rating and features registered ECC architecture for error correction. If you need to populate server memory slots with 16GB DIMMs that match DDR4-2133 specifications, this module directly fits that hardware configuration.
Pros
- 16GB capacity
- Registered ECC support
- CL13 CAS latency
- DDR4-2133 operating frequency
Cons
- Incompatible with standard desktop non-ECC motherboards
- Lower frequency than DDR4-2400 or DDR4-2666 options
Good fit if
- You need 16GB registered ECC memory for a server platform.
- You require DDR4-2133 speed with CL13 latency.
Skip if
- You have a desktop system that does not support registered ECC modules.
- You require higher frequency DDR4 or DDR5 server memory.
Verdict: SK Hynix 16GB DDR4-2133 ECC Registered Server RAM provides error-correcting memory with CL13 latency for compatible server motherboards. It delivers 16GB of registered capacity targeted specifically at platforms designed for DDR4-2133 modules.
SK Hynix 32GB DDR4 ECC Registered Server RAM
Best for: DDR4 servers needing low latency CL15 memory
- Compatible Device
- Server (what this guide is about)
- Capacity
- 32GB
- CAS Latency
- CL15
- ECC Support
- ECC/Reg
View on Amazon: SK Hynix 32GB DDR4 ECC Registered Server RAM
This SK Hynix module gives you 32GB of DDR4 memory running at a 2133MHz clock speed. Built specifically for server hardware, it features registered ECC error checking alongside a CL15 CAS latency. If you manage a server deployment that requires stable registered memory with tighter timing at 2133MHz, this single module fits standard DDR4 server motherboard slots while actively correcting internal data errors.
Pros
- 32GB capacity on a single module
- CL15 CAS latency timing
- ECC support for active error correction
- Registered server design for bus stability
Cons
- Operates at a base DDR4-2133 transfer speed
- Engineered only for servers, not desktop motherboards
Good fit if
- You need 32GB of registered DDR4 memory for a server board.
- You want lower memory latency with CL15 at 2133MHz.
- You require hardware-level ECC support for system stability.
Skip if
- You need faster memory frequencies than 2133MHz.
- You are building a standard desktop system that requires unbuffered RAM.
Verdict: SK Hynix 32GB DDR4-2133 CL15 Server RAM delivers 32GB of registered ECC memory designed for reliable server operation with CL15 timings.
Samsung 32GB DDR4-2400 ECC Registered Server RAM
Best for: Supermicro DDR4 server memory upgrades
- Compatible Device
- Server (what this guide is about)
- Capacity
- 32GB
- Memory Speed
- DDR4-2400
- ECC Support
- ECC Reg
- Dimensions
- 6 × 4 × 0.5 inches
- Weight
- 1.6 ounces
View on Amazon: Samsung 32GB DDR4-2400 ECC Registered Server RAM
This Samsung module delivers 32GB of DDR4 memory running at 2400MHz for server systems. It features a 2Rx4 registered design with ECC support to maintain data integrity under continuous enterprise workloads. Its low-profile height fits standard server chassis where vertical clearance is limited. You will find this module useful if you manage Supermicro servers or require verified DDR4 ECC registered memory for your system boards.
Pros
- 32GB capacity at DDR4-2400 speed
- ECC registered 2Rx4 design for server reliability
- Supermicro certified
- Low-profile physical height
Cons
- DDR4 interface rather than DDR5
- 2400MHz clock rate is slower than newer DDR4 options
- Packaged as a single module rather than a multi-channel kit
Good fit if
- You operate Supermicro hardware that requires certified memory.
- You need low-profile 32GB DDR4 ECC registered memory for server racks.
Skip if
- You run a motherboard platform that requires DDR5 modules.
- You need unbuffered non-ECC memory for desktop hardware.
Verdict: Samsung 32GB DDR4-2400 ECC Registered Server RAM provides certified reliability and a low-profile build for compatible Supermicro DDR4 server boards.
SK Hynix 16GB DDR4 ECC Server RAM
Best for: entry-level DDR4 server memory upgrades
- Compatible Device
- Server (what this guide is about)
- Capacity
- 16Gb
- Memory Speed
- 2133Mhz
- Kit Configuration
- 1X16gb
- ECC Support
- Ecc Registered
- Dimensions
- 5.25 × 0.16 × 1.21 inches
This SK Hynix module is a single 16GB DDR4 server memory stick operating at 2133MHz. It includes ECC support and registered design to provide memory stability for compatible server platforms. The module runs at PC4-17000 speed ratings with standard dimensions of 5.25 inches long and 1.21 inches high. It suits you if you need a basic-capacity DDR4 memory module to maintain or expand an entry-level server.
Pros
- 16GB DDR4 capacity
- ECC registered design for server stability
- Operates at PC4-17000 2133MHz speed
Cons
- Memory speed is limited to 2133MHz
- 16GB capacity is smaller than higher-density modules
Good fit if
- You need a single 16GB DDR4 module for an existing server build.
- You require 2133MHz ECC registered memory.
Skip if
- You require single-module capacities larger than 16GB.
- You need memory speeds faster than 2133MHz.
Verdict: SK Hynix 16GB DDR4 ECC Registered Server RAM delivers standard 2133MHz PC4-17000 operation for compatible server boards. It provides dependable ECC functionality in an individual 16GB configuration.
SK Hynix 64GB DDR4 2666MHz ECC Server RAM
Best for: High-density DDR4 server memory expansions
- Compatible Device
- Server (what this guide is about)
- Capacity
- 64 GB
- Memory Speed
- 2666 MHz
- CAS Latency
- CL 19
- Kit Configuration
- 1 x 64GB
- Voltage
- 1.20 V
This SK Hynix module is a single 64GB DDR4 server memory stick engineered for enterprise hardware. It operates at a clock speed of 2666MHz with a CAS latency of CL19 and runs on a standard 1.20V power profile. If your server requires load-reduced ECC memory to maintain signal stability across high-density configurations, this high-capacity module gives you substantial headroom for demanding deployments.
Pros
- High 64GB capacity on a single module
- 2666MHz operating frequency with CL19 timing
- Standard 1.20V memory operating voltage
- Load-reduced ECC architecture designed for servers
Cons
- Limited to servers and incompatible with standard desktop PCs
- Single-module format requires purchasing multiples for multi-channel setups
Good fit if
- You need 64GB of DDR4 memory in a single slot for your server.
- You require 2666MHz ECC load-reduced memory running at 1.20V.
Skip if
- You are building a newer DDR5-based server platform.
- You need unbuffered RAM for a standard consumer desktop motherboard.
Verdict: SK Hynix 64GB DDR4 2666MHz ECC Server Memory delivers high-density capacity and reliable 1.20V operation for compatible DDR4 server environments. It is a dependable choice when you need substantial memory per slot without moving to newer architectures.
SK Hynix 64GB DDR4 2400MHz ECC LRDIMM
Best for: dense DDR4 server deployments needing load reduction
- Compatible Device
- Server (what this guide is about)
- Capacity
- 64GB
- Memory Speed
- 2400MHz
- CAS Latency
- CL 17
- Form Factor
- 288 Pin
- Voltage
- 1.2V
This SK Hynix module is a 64GB DDR4 server memory stick operating at 2400MHz with CL17 latency. It features error-correcting code support and a 4Rx4 quad-rank load-reduced design running at 1.2 volts. You get substantial memory density per slot alongside reduced electrical load for dense multi-socket boards. It suits you if you need large capacity, stable 288-pin memory for heavy server workloads requiring fault tolerance and low operating voltage.
Pros
- High 64GB capacity on a single module
- Load-reduced 4Rx4 design minimizes bus loading
- Built-in ECC support for memory integrity
- Standard 1.2V low operating voltage
Cons
- Operates at DDR4-2400 rather than faster DDR4 frequencies
- CL17 latency is higher than lower-latency server alternatives
Good fit if
- You need 64GB of load-reduced server memory per slot.
- You require 2400MHz DDR4 ECC memory at 1.2V.
Skip if
- You need a standard unbuffered desktop RAM module.
- You require higher transfer speeds like DDR4-2666.
Verdict: SK Hynix 64GB DDR4 2400MHz ECC LRDIMM delivers high capacity and load-reduced architecture for compatible server platforms. It offers dependable CL17 performance at 1.2V for dense memory deployments.
Nemix RAM 32GB DDR4 2133MHz ECC LRDIMM
Best for: high-density LRDIMM server memory expansion
- Compatible Device
- Server (what this guide is about)
- Capacity
- 32GB
- Memory Speed
- 2133MHz
- Kit Configuration
- 1x32GB
- Form Factor
- 288-pin LRDIMM
- Voltage
- 1.2V
This single 32GB module from Nemix RAM delivers DDR4 2133MHz speeds at 1.2 volts for compatible servers. It features a 288-pin load-reduced LRDIMM design with a 4Rx4 rank configuration and ECC protection. Because load-reduced buffering decreases electrical load across the memory bus, it suits high-DIMM-count server platforms running continuous virtualization or memory-heavy databases. You get a single-module upgrade backed by a lifetime replacement warranty.
Pros
- Load-reduced LRDIMM design lowers electrical load on the memory bus
- Standard 1.2V operating voltage
- ECC protection with 4Rx4 quad-rank structure
- Backed by lifetime replacement warranty and US technical support
Cons
- Memory clock speed tops out at 2133MHz
- Not compatible with RDIMM or UDIMM motherboards
Good fit if
- You need a 32GB 4Rx4 DDR4 module operating at 2133MHz.
- You manage a high-DIMM-count server requiring 288-pin LRDIMM memory.
Skip if
- You have a system that only accepts RDIMM or UDIMM memory.
- You require memory frequencies higher than 2133MHz.
Verdict: Nemix RAM 32GB DDR4 2133MHz ECC LRDIMM provides dedicated 4Rx4 load-reduced memory for dense server setups. It gives you 32GB of stable ECC capacity running at standard 1.2V power.
Nemix RAM 32GB DDR3 1866MHz LRDIMM
Best for: DDR3 servers requiring load-reduced ECC memory
- Compatible Device
- Server (what this guide is about)
- Capacity
- 32GB
- Memory Speed
- 1866MHz
- Kit Configuration
- 1x32GB
- Form Factor
- 240-pin LRDIMM
- Voltage
- 1.5V
This Nemix RAM module gives you 32GB of DDR3-1866 memory for compatible servers. It features a quad-rank 4Rx4 load-reduced design running at 1.5V with ECC error-correcting support. The load-reduction buffer lowers electrical load on your memory bus for dense multi-socket configurations. It suits you if you run virtualization, in-memory databases, or continuous server workloads requiring DDR3 LRDIMMs instead of standard RDIMMs.
Pros
- 32GB capacity per 240-pin module
- Load-reduced design lowers electrical load on the memory bus
- DDR3-1866 PC3-14900 operating speed
- ECC protection for server stability
- Backed by lifetime replacement warranty
Cons
- Uses legacy DDR3 architecture rather than DDR4 or DDR5
- Higher 1.5V operating voltage
- Incompatible with motherboards requiring standard RDIMMs or UDIMMs
Good fit if
- You need 32GB DDR3-1866 4Rx4 LRDIMM memory for an existing server platform.
- You run multi-socket or high-DIMM-count boards requiring load-reduced buffering.
Skip if
- You use a server that requires DDR4 or DDR5 memory.
- You have a system restricted to registered RDIMM or unbuffered UDIMM modules.
Verdict: Nemix RAM 32GB DDR3-1866 ECC LRDIMM delivers high-density quad-rank memory designed for DDR3 servers requiring load-reduced buffering. It provides ECC reliability and 1866MHz speed for multi-socket setups.
Nemix RAM 64GB DDR3 1333MHz LRDIMM
Best for: high-capacity DDR3 server memory expansion
- Compatible Device
- Server (what this guide is about)
- Capacity
- 64GB
- Memory Speed
- 1333MHz
- Kit Configuration
- 1x64GB
- Form Factor
- 240-pin LRDIMM
- Voltage
- 1.5V
This Nemix RAM module gives you 64GB of DDR3 memory running at 1333MHz. Built as an 8Rx4 240-pin LRDIMM operating at 1.5V, it features load-reduced buffering to lower electrical load on the memory bus. It suits older server platforms that require high-density memory per channel for virtualization or database workloads but cannot use standard RDIMM or UDIMM modules.
Pros
- High 64GB density on a single DDR3 module
- Load-reduced buffering lowers bus loading on dense boards
- ECC support for 24/7 multi-socket workloads
- Lifetime replacement warranty with US technical support
Cons
- Operates at DDR3 1333MHz transfer speeds
- Requires a 1.5V power supply
- Not compatible with RDIMM or UDIMM memory sockets
Good fit if
- You operate a DDR3 server board that supports 64GB LRDIMMs.
- You need to maximize memory density across high-DIMM-count channels.
- Your hardware specifically requires 240-pin 1.5V 8Rx4 modules.
Skip if
- You run a modern system that requires DDR4 or DDR5 memory.
- Your server motherboard only accepts RDIMMs or unbuffered UDIMMs.
- Your platform requires 1.2V or 1.35V low-voltage modules.
Verdict: Nemix RAM 64GB DDR3 1333MHz LRDIMM provides maximum density for high-DIMM-count DDR3 server platforms that require load-reduced buffering. It is a targeted upgrade for compatible 240-pin systems running memory-intensive workloads.
Nemix RAM 64GB DDR4 2400MHz ECC LRDIMM
Best for: high-capacity enterprise server virtualization workloads
- Compatible Device
- Server (what this guide is about)
- Capacity
- 64GB
- Memory Speed
- 2400MHz
- CAS Latency
- CL17
- Kit Configuration
- 1x64GB
- Form Factor
- 288-pin LRDIMM
This Nemix RAM module gives you 64GB of DDR4 memory running at 2400MHz with CL17 latency. It uses a 288-pin load-reduced LRDIMM design with a quad-rank 4Rx4 configuration operating at 1.2V. The load-reduced buffer lowers electrical bus load, making it suitable if you maintain high-density server configurations running virtualization or in-memory databases. It is built specifically for server motherboards that require ECC-protected LRDIMM memory modules.
Pros
- High-capacity 64GB single-module density
- Load-reduced LRDIMM design lowers electrical bus load
- Standard 1.2V operating voltage
- ECC error-correcting support
Cons
- Not compatible with RDIMM or UDIMM motherboards
- Limited to 2400MHz speed and CL17 latency
Good fit if
- You need 64GB LRDIMM modules to maximize capacity in high-DIMM-count servers.
- You run virtualization or database workloads requiring 1.2V DDR4 ECC memory.
Skip if
- You have a motherboard that requires standard RDIMMs or unbuffered UDIMMs.
- You need DDR5 speeds or memory frequencies higher than 2400MHz.
Verdict: Nemix RAM 64GB DDR4-2400 ECC LRDIMM provides high-density memory designed to reduce bus loading in compatible servers. Its 4Rx4 quad-rank design and 1.2V operation suit multi-socket virtualization platforms.
NEMIX RAM 32GB DDR3 1600MHz ECC LRDIMM
Best for: 1.35V DDR3 server memory upgrades
- Compatible Device
- Server (what this guide is about)
- Capacity
- 32GB
- Memory Speed
- 1600MHz
- Kit Configuration
- 1x32GB
- Form Factor
- 240-pin LRDIMM
- Voltage
- 1.35V
This Nemix RAM module is a single 32GB DDR3 server memory stick operating at 1600MHz. It features a 240-pin load-reduced LRDIMM design with 4Rx4 rank configuration and runs at 1.35V. It supports ECC for data integrity during intensive computing tasks. You will find this module suitable if you need to populate high-density server or workstation memory banks that specifically require low-voltage DDR3 LRDIMM architecture.
Pros
- Operates at 1.35V for lower power draw
- Load-reduced LRDIMM architecture lowers bus loading
- Supports ECC error correction
- Backed by a lifetime replacement warranty
Cons
- DDR3 speed limited to 1600MHz
- Incompatible with standard RDIMM or UDIMM slots
- Requires platform support for 4Rx4 LRDIMM modules
Good fit if
- You manage servers that require 240-pin 1.35V DDR3 memory.
- You need 32GB quad-rank LRDIMM modules to maximize channel density.
Skip if
- You run DDR4 or DDR5 server motherboards.
- Your system requires standard registered RDIMMs or unbuffered UDIMMs.
Verdict: Nemix RAM 32GB DDR3 1600MHz LRDIMM provides 1.35V quad-rank memory designed for DDR3 servers that mandate load-reduced modules. It delivers a targeted capacity expansion backed by a lifetime replacement warranty.
Nemix RAM 32GB DDR3 1600MHz LRDIMM
Best for: high-density DDR3 server and workstation upgrades
- Compatible Device
- Server (what this guide is about)
- Capacity
- 32GB
- Memory Speed
- 1600MHz
- Kit Configuration
- 1x32GB
- Form Factor
- 240-pin LRDIMM
- Voltage
- 1.5V
This Nemix RAM module is a single 32GB DDR3 LRDIMM designed for compatible servers. Operating at 1600MHz with a 1.5V power draw, it uses a 4Rx4 quad-rank design and a 240-pin load-reduced interface. The load-reduction buffer lowers electrical strain on memory buses for multi-socket enterprise systems. You get dedicated ECC capability for high-density environments requiring stability across intensive 24/7 server workloads and virtualization platforms.
Pros
- Load-reduced LRDIMM design lowers memory bus electrical load
- 32GB capacity running at 1600MHz
- Error-Correcting Code support for data integrity
- Backed by a lifetime replacement warranty
Cons
- Operates at standard 1.5V instead of lower 1.35V profiles
- Incompatible with standard RDIMM or UDIMM server sockets
- Limited to DDR3 architecture rather than newer standards
Good fit if
- You run servers that specifically require 240-pin DDR3 LRDIMMs.
- You need 4Rx4 quad-rank modules operating at 1.5V and 1600MHz.
- You populate high-DIMM-count configurations for virtualization workloads.
Skip if
- You require newer DDR4 or DDR5 server memory modules.
- Your motherboard only supports standard RDIMM or unbuffered UDIMM memory.
Verdict: NEMIX RAM 32GB DDR3 1600MHz LRDIMM provides dedicated quad-rank capacity and error correction for compatible server boards. Its load-reduced architecture enables stable performance in high-density, multi-socket enterprise hardware.
Nemix RAM 64GB DDR4 2133MHz ECC LRDIMM
Best for: high-density DDR4 load-reduced server platforms
- Compatible Device
- Server (what this guide is about)
- Capacity
- 64GB
- Memory Speed
- 2133MHz
- Kit Configuration
- 1x64GB
- Form Factor
- 288-pin LRDIMM
- Voltage
- 1.2V
This single 64GB module is a DDR4-2133 load-reduced server memory module running at 1.2 volts. It uses a 288-pin LRDIMM form factor with a 4Rx4 quad-rank design and ECC support to minimize electrical load across high-density memory configurations. It suits you if you maintain compatible enterprise server or workstation platforms that require high per-slot memory capacity and low bus loading for intensive multi-socket workloads.
Pros
- High 64GB density on a single 288-pin module
- Load-reduced buffer architecture lowers memory bus load
- Standard low-power 1.2V operation
- Error-correcting code (ECC) support for system stability
- Includes manufacturer lifetime replacement warranty
Cons
- Operates at a base DDR4-2133 transfer speed
- Incompatible with motherboards requiring standard RDIMMs or UDIMMs
Good fit if
- You need 64GB density per slot on a server board supporting DDR4 LRDIMMs.
- You run high-memory enterprise workloads requiring ECC and 1.2V operation.
Skip if
- You need unbuffered memory or standard RDIMMs for your system.
- You require memory transfer speeds faster than 2133MHz.
Verdict: Nemix RAM 64GB DDR4-2133 ECC LRDIMM provides high single-slot capacity and bus buffering for enterprise servers. It is built specifically for systems requiring 4Rx4 load-reduced memory at 1.2 volts.
Nemix RAM 64GB DDR4 2666MHz ECC LRDIMM
Best for: High-density LRDIMM server memory expansion
- Compatible Device
- Server (what this guide is about)
- Capacity
- 64GB
- Memory Speed
- 2666MHz
- CAS Latency
- CL19
- Kit Configuration
- 1x64GB
- Form Factor
- 288-pin LRDIMM
This single-module 64GB memory upgrade from Nemix RAM runs at DDR4-2666 speeds with CL19 latency at 1.2V. Built on the 288-pin LRDIMM form factor with a 4Rx4 rank design and ECC support, it lowers electrical load on the memory bus compared to standard modules. You get reliable density for high-DIMM-count server motherboards handling virtualization or multi-socket computing workloads that require verified load-reduced architecture.
Pros
- 64GB capacity on a single 288-pin module
- DDR4 2666MHz operating speed with CL19 timing
- Load-reduced design reduces electrical load on memory channels
- Operates at standard 1.2V with ECC error correction
Cons
- Incompatible with standard RDIMM or UDIMM memory slots
- Quad-rank design requires platform support for 4Rx4 configurations
- Higher CL19 latency than lower-clocked server alternatives
Good fit if
- You need 64GB per slot in high-DIMM-count DDR4 server setups.
- You manage virtualization or database servers that require ECC LRDIMM memory.
- You have a motherboard verified to support 288-pin 4Rx4 load-reduced modules.
Skip if
- You run a motherboard configured exclusively for standard RDIMM or unbuffered UDIMM memory.
- You need lower CAS latency than CL19.
- You operate a platform limited to DDR3 memory or newer DDR5 slots.
Verdict: Nemix RAM 64GB DDR4 2666MHz LRDIMM delivers high density and bus stability for multi-socket servers requiring 4Rx4 load-reduced architecture. It provides an exact spec match for memory-heavy enterprise platforms needing ECC reliability at 1.2V.
Samsung 32GB DDR4 ECC RDIMM
Best for: DDR4 servers needing 2666MHz registered ECC memory
- Compatible Device
- Server (what this guide is about)
- Capacity
- 32GB
- Form Factor
- RDIMM
- ECC Support
- ECC
This Samsung module provides 32GB of DDR4 memory for compatible server platforms. Running at PC4-2666V (PC4-21300) speeds with registered RDIMM architecture and ECC support, it handles continuous workloads. You get registered stability and error correction designed specifically for enterprise server hardware. It suits you if you need moderate capacity per slot with 2666MHz registered memory.
Pros
- 32GB capacity per module
- PC4-2666V (PC4-21300) operating speed
- RDIMM form factor with ECC support
- 2Rx4 dual-rank configuration
Cons
- 32GB capacity is lower than 64GB alternatives
- DDR4 technology rather than newer DDR5 memory
Good fit if
- You need 32GB DDR4 registered memory running at 2666MHz for your server.
- You require ECC RDIMM modules for stable enterprise hardware operations.
Skip if
- You require larger 64GB modules to maximize per-slot memory capacity.
- You operate newer server platforms that require DDR5 memory.
Verdict: Samsung 32GB 2666MHz DDR4 RDIMM Server RAM fits system administrators maintaining DDR4 enterprise servers who require registered ECC stability at 2666MHz speeds. It delivers standard dual-rank capacity for balanced multi-channel server deployments.
Specifications side by side
| Spec | SK Hynix 16GB DDR4-2133 ECC Registered Server Memory | SK Hynix 32GB DDR4 ECC Registered Server RAM | Samsung 32GB DDR4-2400 ECC Registered Server RAM | SK Hynix 16GB DDR4 ECC Server RAM | SK Hynix 64GB DDR4 2666MHz ECC Server RAM | SK Hynix 64GB DDR4 2400MHz ECC LRDIMM | Nemix RAM 32GB DDR4 2133MHz ECC LRDIMM | Nemix RAM 32GB DDR3 1866MHz LRDIMM | Nemix RAM 64GB DDR3 1333MHz LRDIMM | Nemix RAM 64GB DDR4 2400MHz ECC LRDIMM | NEMIX RAM 32GB DDR3 1600MHz ECC LRDIMM | Nemix RAM 32GB DDR3 1600MHz LRDIMM | Nemix RAM 64GB DDR4 2133MHz ECC LRDIMM | Nemix RAM 64GB DDR4 2666MHz ECC LRDIMM | Samsung 32GB DDR4 ECC RDIMM |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Capacity | 16GB | 32GB | 32GB | 16Gb | 64 GB | 64GB | 32GB | 32GB | 64GB | 64GB | 32GB | 32GB | 64GB | 64GB | 32GB |
| Memory Speed | 2133MHz | not specified | DDR4-2400 | 2133Mhz | 2666 MHz | 2400MHz | 2133MHz | 1866MHz | 1333MHz | 2400MHz | 1600MHz | 1600MHz | 2133MHz | 2666MHz | not specified |
| CAS Latency | CL13 | CL15 | not specified | not specified | CL 19 | CL 17 | not specified | not specified | not specified | CL17 | not specified | not specified | not specified | CL19 | not specified |
| Kit Configuration | not specified | not specified | not specified | 1X16gb | 1 x 64GB | not specified | 1x32GB | 1x32GB | 1x64GB | 1x64GB | 1x32GB | 1x32GB | 1x64GB | 1x64GB | not specified |
| Form Factor | not specified | not specified | not specified | not specified | not specified | 288 Pin | 288-pin LRDIMM | 240-pin LRDIMM | 240-pin LRDIMM | 288-pin LRDIMM | 240-pin LRDIMM | 240-pin LRDIMM | 288-pin LRDIMM | 288-pin LRDIMM | RDIMM |
| Voltage | not specified | not specified | not specified | not specified | 1.20 V | 1.2V | 1.2V | 1.5V | 1.5V | 1.2V | 1.35V | 1.5V | 1.2V | 1.2V | not specified |
| ECC Support | ECC/REG | ECC/Reg | ECC Reg | Ecc Registered | ECC/REG | ECC | ECC | ECC | ECC | ECC | ECC | ECC | ECC | ECC | ECC |
| Compatible Device | Server | Server | Server | Server | Server | Server | Server | Server | Server | Server | Server | Server | Server | Server | Server |
| Size | 16GB | 32GB | 32GB | 16GB | 64GB | 64GB | 32GB (1X32GB) DDR4 2133MHZ LRDIMM | 32GB | 64GB | 64GB (1X64GB) DDR4 2400MHZ LRDIMM | 32GB (1X32GB) DDR3 1600MHZ LRDIMM | 32GB (1X32GB) DDR3 1600MHZ LRDIMM | 64GB (1X64GB) DDR4 2133MHZ LRDIMM | 64GB (1X64GB) DDR4 2666MHZ LRDIMM | 32GB |
| Dimensions | not specified | not specified | 6 × 4 × 0.5 inches | 5.25 × 0.16 × 1.21 inches | 9 × 6 × 4 inches | 9 × 6 × 1 inches | 6 × 0.5 × 0.5 inches | 6 × 0.5 × 0.5 inches | 6 × 0.5 × 0.5 inches | 6 × 0.5 × 0.5 inches | 6 × 0.5 × 0.5 inches | 6 × 0.5 × 0.5 inches | 6 × 0.5 × 0.5 inches | 6 × 0.5 × 0.5 inches | not specified |
| Weight | not specified | not specified | 1.6 ounces | not specified | not specified | not specified | 4 ounces | 4 ounces | 4 ounces | 4 ounces | 4 ounces | 4 ounces | 4 ounces | 4 ounces | not specified |
| Model | HMA42GR7MFR4N-TF | not specified | M393A4K40BB1-CRC | HMA42GR7AFR4N-TF | HMAA8GL7AMR4N-VK | HMAA8GL7MMR4N-UH | ML17000-344K01-106 | ML14900-344K01-37 | ML10600-984K01-54 | ML19200-944K01-102 | ML12800-344LK01-36 | ML12800-344K01-35 | ML17000-944K01-105 | ML21300-944K01-103 | M393A4K40BB2-CTD |
| Color | not specified | not specified | Black | Multicolor | Multicolor | Multicolor | 32GB | 32GB | 64GB | 64GB | Black | Black | 64GB | 64GB | not specified |
Is Server Memory Worth It?
Server compatibility matters because these memory modules are built specifically for enterprise server boards and multi-socket setups. Every product in this list specifies server compatibility alongside ECC support and registered or load-reduced architectures like RDIMM and LRDIMM. These hardware standards do not work in standard desktop systems. Choosing modules with server compatibility gives you dedicated error correction and stable high-density operation in capacities up to 64GB per slot. If your motherboard requires dedicated server memory, standard desktop RAM will not boot.
Worth it if
- You run an enterprise or multi-socket server board that requires registered RDIMM or LRDIMM modules.
- You need hardware-level ECC support to maintain stability during continuous server workloads.
- You require high single-slot capacities of 32GB or 64GB on supported DDR3 or DDR4 server platforms.
Skip it if
- You use a standard desktop motherboard that does not accept registered ECC or load-reduced server memory.
- You build on a newer motherboard platform that requires DDR5 modules rather than DDR3 or DDR4.
You can verify memory channel limits and DIMM slot support across the best motherboards for server.
How We Picked Server RAM
You find memory options in this guide by checking published specifications and feature bullets for server compatibility. A product qualifies when its listing explicitly confirms server support in the title or attribute list. Only one capacity or variant from each product family appears on the page. All details come directly from manufacturer spec sheets, without physical handling.
To help you evaluate these options, we compare published specifications including memory speed, module form factor like RDIMM or LRDIMM, ECC support, CAS latency, and operating voltage. The 15 selections appear with products in stock first. Current availability and pricing update on the page at least daily.
How to Choose Server Memory Modules
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Match Memory Operating Speed
Check motherboard chipset and CPU specs for supported transfer rate. Listed speeds include 1333MHz, 1600MHz, 1866MHz, 2133MHz, 2400MHz, and 2666MHz. Higher speeds like 2666MHz increase data transfer bandwidth for high-throughput server workloads. If your system caps out at 2133MHz, installing modules like the SK Hynix 16GB DDR4-2133 operates at native rates without clock down issues. Always verify the maximum frequency your specific server processor supports across its populated memory channels. Installing faster RAM into a lower-rated bus forces the module to downclock to match platform limits.
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Select Module Capacity Density
Density per slot determines total system RAM capacity. Listed options provide 16GB, 32GB, or 64GB single modules. Choosing 64GB units maximizes total memory in servers with limited DIMM slots, such as virtualization hosts. Smaller 16GB options suit basic setups with low memory footprint requirements. Compare your target memory total against your motherboard slot count to identify whether 32GB or 64GB individual sticks fit your expansion plans. High-density modules like the SK Hynix 64GB DDR4 2666MHz keep open slots available for future server memory expansions without replacing existing hardware.
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Evaluate CAS Latency Timings
CAS latency defines the clock cycle delay before data transfers begin. Lower latency ratings mean fewer clock cycles of delay. The listed server modules specify latencies ranging from CL13 up to CL19. The SK Hynix 32GB DDR4 ECC Registered Server RAM features CL15 timings, reducing access delay compared to CL19 options running at identical bus clocks. Match latency across all modules installed within the same memory channel. When you mix modules featuring differing timings, your motherboard firmware automatically downclocks timings to match the slowest module installed in the system.
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Check Operating Voltage Levels
Operating voltage depends on memory generation and board power regulation. Listed DDR4 server modules run at 1.2V, while DDR3 modules require either 1.35V or 1.5V power levels. The NEMIX RAM 32GB DDR3 1600MHz ECC LRDIMM operates at 1.35V, which matches low-voltage DDR3 server configurations. Standard DDR3 hardware requires 1.5V modules to maintain stability. Check your server chassis manual before purchasing memory modules. Supplying mismatched voltage causes system instability or memory initialization failure during power-on self-tests. Always verify that your motherboard supports the specific voltage listed on the module.
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Examine Rank Configurations
Memory rank describes how memory chips arrange on the module bus. Products in this guide feature dual-rank 2R4 designs and quad-rank 4Rx4 layouts. The Timetec 32GB DDR4 2666MHz RDIMM uses a dual-rank 2R4 design, keeping electrical load moderate for dual-channel or quad-channel boards. In contrast, quad-rank modules pack more chips per stick to achieve dense capacities. Motherboards enforce strict maximum rank limits per channel. Check your system manual to ensure the total number of ranks across all populated memory slots stays within the documented limits of your server CPU and chipset.
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Verify Physical Module Height
Check physical clearance to ensure modules fit inside tight chassis enclosures without hitting fans or shrouds. Listed dimensions show heights from 0.5 inches up to 4 inches. The Samsung 32GB DDR4-2400 ECC Registered Server RAM provides a low-profile height of 0.5 inches, fitting dense 1U rackmount enclosures. Taller modules may block internal airflow baffles or collide with low-hanging expansion risers. Measure vertical space above your DIMM slots before ordering. Ensuring your server has sufficient vertical clearance prevents physical collisions with rack covers, internal drive cages, or dedicated processor cooling ductwork.
Frequently asked questions
Can you install DDR4 or DDR3 server memory into a DDR5 server slot?
No, you cannot physically or electrically seat DDR3 or DDR4 modules into DDR5 motherboard slots. Memory generations feature different pin counts, pin layouts, and notch positions to prevent insertion into incompatible boards. Server motherboards strictly support a single generation determined by the socket and CPU architecture. Always verify your board standard before purchasing modules.
What does CAS latency mean for server RAM modules?
CAS latency measures the delay in clock cycles between a memory read command and available data. When you evaluate lower CAS latency ratings like CL13 or CL15, they respond faster than CL17 or CL19 at matching frequencies. Still, you should prioritize compatibility and system stability over minimal latency gains in multi-socket server workloads.
Why do server memory modules operate at different voltages?
Memory voltage reflects the electrical specification required by a specific DDR generation and module type. DDR4 hardware runs standard at 1.2V, while DDR3 server modules require 1.5V or low-voltage 1.35V rails. Motherboards cannot adjust slot traces across generational voltage bounds, so you must select the precise operating voltage indicated in your server hardware manual.
What is the difference between standard and low-profile server RAM?
Low-profile server RAM features reduced physical module height to fit compact chassis constraints. For example, modules measuring 0.5 inches in height slide easily into your 1U rackmount enclosures without obstructing cooling airflow. Standard-height modules provide identical capacities and clock timings but require you to have larger vertical clearance inside standard rack cases or tower enclosures.
Can you install registered server RAM into a desktop PC?
No, standard desktop motherboards do not support registered RDIMM or load-reduced LRDIMM server modules. Consumer chipsets lack the register clock drivers and advanced memory controller logic needed to initialize buffered hardware. Attempting to install registered server modules into a desktop PC will prevent the system from booting. You must use unbuffered desktop memory instead.
How does single-module RAM capacity affect server scalability?
Higher single-module capacities allow you to reach massive system RAM totals without filling every slot. Modules offering 32GB or 64GB densities permit dense virtualization workloads while leaving open memory channels for future expansion. Choosing maximum capacity per stick also reduces overall motherboard trace congestion across dual-socket or quad-socket enterprise processor designs.
What does memory rank like dual-rank or quad-rank mean for server RAM?
Rank refers to the number of independent 64-bit data blocks engineered onto a memory stick. When you pick a dual-rank 2R module, it provides two distinct blocks, whereas a quad-rank 4Rx4 module packs four. Multi-rank modules maximize slot density, but your server motherboard limits total channel ranks to maintain clean signaling.