Best DDR4 RAMS for Server in 2026: 15 Picks Ranked by Specs
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Selecting the best ddr4 RAMs for server environments requires matching specific module types to your hardware constraints. We compared 15 options based strictly on published specifications to help you identify the right fit. The Kingston 64GB DDR4 ECC REG Server Kit leads this list because its 64GB capacity and registered ECC design ensure stability for high-capacity deployments. Each pick is ranked by measurable attributes like speed, latency, and form factor. This guide helps you decide which memory configuration aligns with your server’s architecture and workload demands.
Quick picks
The best fit for you
- You need high-capacity server memory stability Kingston 64GB DDR4 ECC REG Server Kit Its 64GB size and registered ECC design provide enterprise stability for capacity-focused servers.
- You want the lowest latency DDR4 timings SK Hynix 16GB DDR4-2133 ECC Registered Server Memory The SK Hynix 16GB module offers a tight CL13 latency at 2133MHz.
- You need maximum single-slot memory density SK Hynix 64GB DDR4 2666MHz ECC Server RAM This 64GB LRDIMM delivers high density at 2666MHz for virtualization platforms.
- You maintain entry-level legacy DDR4 servers SK Hynix 16GB DDR4 ECC Server RAM The 16GB 2133MHz module provides reliable error-checking for modest memory expansions.
Our 15 picks
Kingston 64GB DDR4 ECC REG Server Kit
Best for: high-capacity server memory stability
- Compatible Device
- Server (what this guide is about)
- Total Capacity
- 64GB
- Memory Speed
- 2133MHz
- CAS Latency
- CL15
- Module Configuration
- 4x16GB
- Form Factor
- DIMM
View on Amazon: Kingston 64GB DDR4 ECC REG Server Kit Affiliate link
This Kingston kit provides 64GB of DDR4 memory configured as four 16GB modules. It runs at 2133MHz with CL15 latency and includes ECC and registered DIMM support for server stability. The design lowers power usage compared to older standards. It suits administrators needing reliable, high-capacity storage for enterprise workloads without requiring frequent upgrades.
Pros
- 64GB total capacity across four 16GB modules
- ECC and Registered DIMM support for data integrity
- 2133MHz speed with CL15 latency
- Lower voltage operation saves power
Cons
- 2133MHz speed is slower than 2400MHz or 2666MHz competitors
- Requires installing four modules to reach full capacity
- No mention of specific heat spreader or cooling features
Good fit if
- You need maximum capacity in a single kit
- You require ECC registered memory for server stability
- You are building a system with four memory slots
Skip if
- You need speeds above 2133MHz
- You only have two memory slots available
- You prefer single stick configurations for easier upgrades
Verdict: Kingston 64GB DDR4 ECC REG Server Kit delivers essential enterprise stability with its registered ECC design. It is ideal for servers where capacity and error correction matter more than raw speed.
SK Hynix 16GB DDR4-2133 ECC Registered Server Memory
Best for: low-latency DDR4 server deployments
- Compatible Device
- Server (what this guide is about)
- Total Capacity
- 16GB
- Memory Speed
- 2133 MHz
- CAS Latency
- CL13
- ECC Support
- ECC REG
View on Amazon: SK Hynix 16GB DDR4-2133 ECC Registered Server Memory Affiliate link
This SK Hynix module gives you 16GB of DDR4 server memory operating at 2133MHz. It features registered ECC support to protect against data corruption during continuous uptime. With a tight CAS latency of CL13, it provides rapid memory response times compared to standard server modules. It suits you if you run enterprise servers requiring low-latency registered DDR4.
Pros
- Low CAS latency of CL13
- Registered ECC error correction for server stability
- Standard 2133MHz DDR4 operating frequency
Cons
- 16GB capacity is smaller than 32GB and 64GB options on this list
- 2133MHz clock speed is lower than 2400MHz or 2666MHz alternatives
Good fit if
- You need registered ECC DDR4 memory for a compatible server motherboard.
- You prioritize lower CL13 access latency over peak clock speeds.
- You want 16GB modules to fill multi-channel memory configurations.
Skip if
- You need higher-density 32GB or 64GB DIMMs to maximize capacity.
- You require faster memory clocks like 2400MHz or 2666MHz.
Verdict: SK Hynix 16GB 2133MHz CL13 ECC Server RAM fits system administrators building or maintaining server platforms that require stable registered memory with tighter access timings.
SK Hynix 32GB DDR4 ECC Registered Server RAM
Best for: CL15 registered DDR4-2133 server configurations
- Compatible Device
- Server (what this guide is about)
- Total Capacity
- 32 GB
- Memory Speed
- 2133MHz
- CAS Latency
- CL15
- ECC Support
- ECC/Reg
- Size
- 32GB
View on Amazon: SK Hynix 32GB DDR4 ECC Registered Server RAM Affiliate link
This SK Hynix server module gives you 32GB of DDR4 memory running at 2133 MHz with CL15 CAS latency. Registered ECC support provides real-time data error correction for continuous server operations. It suits system builders who need stable DDR4-2133 infrastructure, tight CL15 timing, and error-checking capabilities for server platforms matching these specifications.
Pros
- Registered ECC support for system error correction
- CL15 CAS latency timing
- 32GB single-module capacity
Cons
- 2133 MHz clock frequency is slower than 2400 MHz and 2666 MHz options
- 32GB capacity is smaller than available 64GB alternatives
Good fit if
- You need registered ECC memory running at DDR4-2133 speeds.
- You require low CL15 CAS latency for your server workloads.
- You are configuring a server board optimized for 32GB modules.
Skip if
- You need higher memory frequencies such as 2400 MHz or 2666 MHz.
- You require 64GB density per slot to maximize server capacity.
Verdict: SK Hynix 32GB DDR4-2133 CL15 ECC Server RAM delivers registered error correction and low CL15 timing for systems standardized on 2133 MHz memory buses.
SK Hynix 32GB DDR4-2400 ECC REG
Best for: Single stick server memory upgrades
- Compatible Device
- Server (what this guide is about)
- Total Capacity
- 32GB
- Memory Speed
- 2400MHz
- Form Factor
- DIMM
- ECC Support
- ECC REG
- Dimensions
- 6 × 1 × 0.2 inches
View on Amazon: SK Hynix 32GB DDR4-2400 ECC REG Affiliate link
This SK Hynix module is a 32GB DDR4-2400 registered DIMM designed for server environments. It features ECC support to correct data errors and registered architecture for stability. The kit operates at 1.2V. It fits standard 288-pin server slots. You should consider this option if you need reliable, single-stick memory upgrades for enterprise hardware that requires registered ECC modules.
Pros
- 32GB capacity per stick
- DDR4-2400 speed
- ECC support for error correction
- Registered (REG) architecture
Cons
- Single stick capacity may limit total system memory
- Lower speed than DDR4-2666 or 2933 options
- Registered type not compatible with standard desktop motherboards
Good fit if
- You need a single 32GB stick for server expansion
- Your server requires registered ECC memory
- You prioritize stability over maximum bandwidth
Skip if
- You are building a desktop PC
- You need higher speeds like 2666MHz or 2933MHz
- You require unbuffered non-ECC memory
Verdict: SK Hynix 32GB DDR4-2400 ECC REG is a solid choice for server administrators needing a single high-capacity registered module. It fits users who value ECC reliability over higher clock speeds.
Samsung 32GB DDR4-2400 ECC Registered Server RAM
Best for: Supermicro servers needing 2400MHz ECC memory
- Compatible Device
- Server (what this guide is about)
- Total Capacity
- 32GB
- Memory Speed
- 2400MHz
- ECC Support
- LP ECC REG
- Dimensions
- 6 × 4 × 0.5 inches
- Weight
- 1.6 ounces
View on Amazon: Samsung 32GB DDR4-2400 ECC Registered Server RAM Affiliate link
This Samsung module gives you 32GB of registered DDR4 memory operating at 2400MHz. It features a 2Rx4 low-profile design with registered ECC error correction to protect server data from corruption. It carries Supermicro certification and RoHS compliance. If you operate compatible enterprise server hardware that requires stable low-profile 2400MHz memory, this module meets those deployment standards.
Pros
- 32GB capacity with 2Rx4 rank architecture
- Registered ECC support for server data integrity
- Supermicro certified for verified system compatibility
- Low-profile form factor for server chassis clearance
Cons
- DDR4-2400 speed is slower than 2666MHz server options
- 32GB module size offers less density than 64GB alternatives
Good fit if
- You run a server platform designed for 2400MHz registered ECC DDR4 RAM.
- You deploy or maintain Supermicro server infrastructure.
- You require low-profile memory sticks for compact server enclosures.
Skip if
- You require faster DDR4-2666 memory throughput.
- You need 64GB memory density per motherboard slot.
Verdict: Samsung 32GB DDR4-2400 ECC Registered Server RAM provides verified reliability and error correction for systems requiring 2400MHz low-profile modules. It suits administrators managing compatible Supermicro and enterprise server deployments.
SK Hynix 16GB DDR4 ECC Server RAM
Best for: entry-level server maintenance and modest memory expansions
- Compatible Device
- Server (what this guide is about)
- Total Capacity
- 16Gb
- Memory Speed
- 2133Mhz
- Module Configuration
- 1X16gb
- ECC Support
- Ecc Registered
- Dimensions
- 5.25 × 0.16 × 1.21 inches
View on Amazon: SK Hynix 16GB DDR4 ECC Server RAM Affiliate link
This SK Hynix module provides 16GB of DDR4 memory for your server. Running at 2133MHz on the PC4-17000 standard, it features ECC registered support to detect and correct data errors. It suits you if you need a single 1x16GB replacement or want to expand basic server capacity without higher memory frequencies.
Pros
- ECC registered design provides enterprise error correction
- Standard 2133MHz DDR4 speed matches entry server platforms
- Single 16GB module allows straightforward single-slot upgrades
Cons
- 16GB capacity is lower than the 32GB and 64GB alternatives on this list
- 2133MHz clock speed is slower than 2400MHz and 2666MHz options
Good fit if
- You need a single 16GB ECC registered DDR4 module for an existing server setup.
- You run a server board limited to 2133MHz PC4-17000 memory speeds.
Skip if
- You require higher density per slot, such as 32GB or 64GB modules.
- You need faster 2400MHz or 2666MHz DDR4 memory transfer rates.
Verdict: SK Hynix 16GB 2133MHz ECC Registered Server RAM suits administrators maintaining entry-level or legacy DDR4 servers that run at PC4-17000 speeds. It gives you reliable error-checking capacity in a modest single-module size.
SK Hynix 64GB DDR4 2666MHz ECC Server RAM
Best for: high-density server virtualization and memory expansion
- Compatible Device
- Server (what this guide is about)
- Total Capacity
- 64GB
- Memory Speed
- 2666MHz
- CAS Latency
- CL19
- Voltage
- 1.20 V
- Module Configuration
- 1x64GB
View on Amazon: SK Hynix 64GB DDR4 2666MHz ECC Server RAM Affiliate link
This SK hynix server module delivers 64GB of DDR4 memory running at 2666MHz on a standard 1.20V draw. It features load-reduced ECC architecture to support heavy enterprise workloads while maintaining signal integrity across dense board layouts. If your server platform requires high density and standard 2666MHz speeds, this single 64GB stick gives you scalable capacity.
Pros
- High 64GB capacity on a single stick
- 2666MHz operating frequency
- Standard 1.20V operating voltage
- Load-reduced ECC architecture for dense memory configurations
Cons
- CL19 latency is higher than CL15 and CL17 options
- Single-module packaging requires purchasing multiples for multi-channel setups
Good fit if
- You need 64GB of capacity in a single slot for high-density server configurations.
- You run a server platform supporting 2666MHz DDR4 load-reduced memory.
Skip if
- You need lower CAS latency than CL19 for latency-bound applications.
- You already run standard registered RDIMMs that cannot mix with load-reduced modules.
Verdict: SK hynix 64GB 2666MHz DDR4 ECC LRDIMM fits system administrators seeking maximum single-slot memory density at 2666MHz for virtualization platforms.
SK Hynix 64GB DDR4 2400MHz ECC LRDIMM
Best for: high-density 2400MHz LRDIMM server memory expansion
- Compatible Device
- Server (what this guide is about)
- Total Capacity
- 64GB
- Memory Speed
- 2400MHz
- CAS Latency
- CL 17
- Voltage
- 1.2V
- Form Factor
- Load Reduced
View on Amazon: SK Hynix 64GB DDR4 2400MHz ECC LRDIMM Affiliate link
This SK Hynix server module supplies 64GB of DDR4 memory running at 2400MHz with CL17 latency. It features error-correcting code support and a load-reduced 4Rx4 design operating at 1.2V across a 288-pin interface. You get substantial memory density per slot for compatible enterprise servers that require load-reduced hardware rather than standard registered modules.
Pros
- High 64GB capacity on a single stick
- Standard low-power 1.2V operation
- Load-reduced 4Rx4 architecture with ECC
Cons
- Lower 2400MHz speed compared to 2666MHz alternatives
- Load-reduced design cannot mix with standard RDIMMs
Good fit if
- You need 64GB per slot to maximize server memory capacity.
- You run a server board configured for 2400MHz LRDIMMs.
Skip if
- You require faster 2666MHz data transfer rates.
- You currently use standard registered RDIMMs in your server.
Verdict: SK Hynix 64GB DDR4 2400MHz LRDIMM provides high-density ECC memory for administrators outfitting compatible enterprise systems with 64GB load-reduced modules.
Nemix RAM 32GB DDR4 2133MHz ECC LRDIMM
Best for: dense multi-socket server memory channels
- Compatible Device
- Server (what this guide is about)
- Total Capacity
- 32GB
- Memory Speed
- 2133MHz
- Voltage
- 1.2V
- Module Configuration
- 1x32GB
- Form Factor
- LRDIMM
View on Amazon: Nemix RAM 32GB DDR4 2133MHz ECC LRDIMM Affiliate link
This Nemix RAM module provides 32GB of DDR4 memory running at 2133MHz and 1.2V. Built as a 288-pin load-reduced DIMM (LRDIMM) with a quad-rank (4Rx4) layout, it lowers electrical load on the bus to support high-density configurations. It fits your server if you manage multi-socket virtualization or memory-heavy databases requiring ECC LRDIMM architecture across multiple memory channels.
Pros
- Load-reduced (LRDIMM) design buffers signals to decrease bus load
- Quad-rank (4Rx4) 32GB density per module
- Standard 1.2V operating voltage
- Includes lifetime replacement warranty
Cons
- 2133MHz clock speed is lower than 2400MHz and 2666MHz server modules
- 32GB capacity provides less density per slot than available 64GB options
Good fit if
- You need 288-pin DDR4 LRDIMM modules to minimize bus loading across high-DIMM-count slots.
- You maintain an enterprise server motherboard rated for 2133MHz ECC memory.
Skip if
- You operate a system that only accepts standard unbuffered (UDIMM) or registered (RDIMM) memory.
- You need higher memory throughput such as 2400MHz or 2666MHz.
Verdict: Nemix RAM 32GB DDR4-2133 ECC LRDIMM gives system administrators a quad-rank, load-reduced module designed for high-density multi-socket servers requiring 2133MHz operation.
NEMIX 32GB DDR4-2400 LRDIMM
Best for: high-density LRDIMM server upgrades
- Compatible Device
- Server (what this guide is about)
- Total Capacity
- 32GB
- Memory Speed
- 2400MHz
- CAS Latency
- CL17
- Voltage
- 1.2V
- Module Configuration
- 1x32GB
View on Amazon: NEMIX 32GB DDR4-2400 LRDIMM Affiliate link
This NEMIX module provides 32GB of DDR4 memory running at 2400MHz with ECC protection. It uses the LRDIMM form factor, which reduces electrical load on the memory bus. This allows high-DIMM-count server boards to reach higher capacities per channel. The 1.2V voltage and CL17 latency are standard for this class. It suits virtualization and in-memory database workloads that require stable, registered operation.
Pros
- 32GB capacity per stick for high-density configurations
- LRDIMM form factor lowers electrical load on the bus
- ECC support ensures data integrity for server workloads
- 2400MHz speed with CL17 latency
Cons
- LRDIMM is not compatible with standard RDIMM or UDIMM slots
- Single stick configuration requires careful population rules
- Limited to 2400MHz speed compared to faster DDR4 options
Good fit if
- You need LRDIMM support for high-capacity server channels
- You run virtualization or in-memory database workloads
- You require ECC protection for 24/7 multi-socket operations
Skip if
- Your server only supports RDIMM or UDIMM modules
- You need higher speeds than 2400MHz
- You are upgrading a standard workstation without LRDIMM slots
Verdict: NEMIX 32GB DDR4-2400 LRDIMM fits servers that specifically require load-reduced memory for maximum channel capacity. It is not suitable for systems limited to standard registered or unbuffered DIMMs.
Nemix RAM 64GB DDR4 2400MHz ECC LRDIMM
Best for: high-density LRDIMM server memory expansion
- Compatible Device
- Server (what this guide is about)
- Total Capacity
- 64GB
- Memory Speed
- 2400MHz
- CAS Latency
- CL17
- Voltage
- 1.2V
- Module Configuration
- 1x64GB
View on Amazon: Nemix RAM 64GB DDR4 2400MHz ECC LRDIMM Affiliate link
This single-module upgrade provides 64GB of DDR4 memory running at 2400MHz with CL17 latency at 1.2V. Because it is a 4Rx4 load-reduced DIMM (LRDIMM), it buffers memory bus signals to support high-density configurations across multiple sockets. You will find it suitable if your server platform specifically requires 288-pin LRDIMMs for memory-heavy virtualization or data processing.
Pros
- High 64GB density per single 288-pin module
- Load-reduced buffering reduces electrical load on memory channels
- Standard low-voltage 1.2V power requirement
- Backed by a lifetime replacement warranty
Cons
- 2400MHz clock rate is slower than DDR4-2666 alternatives
- Incompatible with boards that only support standard RDIMM or UDIMM formats
Good fit if
- You need 64GB density per slot on an LRDIMM-compatible server board.
- You operate multi-socket virtualization or database hosts using 2400MHz memory.
Skip if
- You manage a system limited to standard registered RDIMM or unbuffered memory.
- You require memory platforms operating at DDR4-2666 transfer rates.
Verdict: Nemix RAM 64GB DDR4-2400 ECC LRDIMM delivers high module density for server administrators needing 4Rx4 load-reduced memory for large multi-socket virtualization deployments.
Nemix RAM 64GB DDR4 2133MHz ECC LRDIMM
Best for: high-density virtualization servers requiring LRDIMM stability
- Compatible Device
- Server (what this guide is about)
- Total Capacity
- 64GB
- Memory Speed
- 2133MHz
- Voltage
- 1.2V
- Module Configuration
- 1x64GB
- Form Factor
- LRDIMM
View on Amazon: Nemix RAM 64GB DDR4 2133MHz ECC LRDIMM Affiliate link
This Nemix module is a single 64GB DDR4 load-reduced server memory module running at 2133MHz and 1.2V. Built on a quad-rank 4Rx4 architecture with 288 pins, it reduces electrical load on the memory bus for dense configurations. It suits you if you need to maximize RAM capacity across multiple sockets without overloading your server's memory controller.
Pros
- High-density 64GB capacity on a single module
- Load-reduced buffering lowers electrical load on the memory bus
- Standard 1.2V low-power DDR4 operation
- Backed by a lifetime replacement warranty
Cons
- Base 2133MHz clock speed is slower than 2400MHz and 2666MHz alternatives
- LRDIMM architecture cannot be mixed with standard RDIMM or UDIMM modules
Good fit if
- You need 64GB module density in an LRDIMM-compatible server platform.
- You operate multi-socket systems requiring quad-rank 4Rx4 buffering.
Skip if
- You require faster memory transfer rates such as 2400MHz or 2666MHz.
- Your server motherboard supports only registered RDIMMs or unbuffered DIMMs.
Verdict: NEMIX RAM 64GB DDR4-2133 ECC LRDIMM delivers high per-slot density for virtualization hosts that prioritize bus stability over peak memory frequencies.
Nemix RAM 64GB DDR4 2666MHz ECC LRDIMM
Best for: high-density server virtualization and database workloads
- Compatible Device
- Server (what this guide is about)
- Total Capacity
- 64GB
- Memory Speed
- 2666MHz
- CAS Latency
- CL19
- Voltage
- 1.2V
- Module Configuration
- 1x64GB
View on Amazon: Nemix RAM 64GB DDR4 2666MHz ECC LRDIMM Affiliate link
This module is a single 64GB DDR4-2666 memory stick built for server boards requiring load-reduced memory. It operates at 1.2V with CL19 latency and uses a 4Rx4 rank configuration. The load-reduced buffer minimizes bus load across multi-socket configurations. You should consider this stick if you need high memory density and error-correcting code protection for virtualization tasks.
Pros
- 64GB single-module capacity
- 2666MHz speed with 1.2V operation
- ECC load-reduced design (LRDIMM)
- Lifetime replacement warranty
Cons
- CL19 CAS latency is slower than CL17 options
- Requires platform support specifically for LRDIMM modules
Good fit if
- You run high-density virtualization or in-memory server databases.
- You need 64GB DDR4-2666 modules with load-reduced buffering.
- You have a motherboard compatible with 4Rx4 288-pin LRDIMMs.
Skip if
- You operate a server board restricted to standard RDIMM or UDIMM memory.
- You require memory with lower CAS latency than CL19.
Verdict: Nemix RAM 64GB DDR4-2666 ECC LRDIMM suits administrators populating high-capacity multi-socket servers that require buffered load-reduced memory. Its 4Rx4 configuration and 2666MHz speed fit heavy virtualization setups that support 1.2V LRDIMMs.
Samsung 32GB DDR4 ECC RDIMM
Best for: Standard 2666MHz DDR4 enterprise server upgrades
- Compatible Device
- Server (what this guide is about)
- Total Capacity
- 32GB
- Memory Speed
- 2666 MT/s
- Form Factor
- RDIMM
- ECC Support
- ECC
View on Amazon: Samsung 32GB DDR4 ECC RDIMM Affiliate link
This Samsung module delivers 32GB of DDR4 memory running at 2666MHz (PC4-21300) for server platforms. Built as an ECC registered DIMM (RDIMM) with a 2Rx4 rank layout, it offers active error checking to safeguard system stability under enterprise workloads. It suits server administrators who need standard registered error-correcting memory to expand existing DDR4 deployments.
Pros
- 32GB capacity per module
- 2666MHz speed (PC4-21300 standard)
- ECC registered (RDIMM) form factor
- Dual-rank (2Rx4) architecture
Cons
- Provides lower capacity per stick than 64GB server modules
- Product specifications omit the CAS latency timing
Good fit if
- You need a 32GB DDR4 RDIMM running at 2666MHz.
- You require error-correcting code support for an enterprise server.
Skip if
- You need high-capacity 64GB modules to maximize per-slot density.
- Your motherboard requires Load-Reduced DIMMs (LRDIMMs) rather than RDIMMs.
Verdict: Samsung 32GB DDR4-2666 ECC RDIMM fits enterprise server platforms requiring dependable 2666MHz error-correcting memory in balanced dual-rank configurations.
A-Tech 32GB DDR4 2400MHz ECC LRDIMM
Best for: Dell PowerEdge R630 load-reduced memory expansion
- Compatible Device
- Server (what this guide is about)
- Total Capacity
- 32GB
- Memory Speed
- 2400MHz
- Voltage
- 1.2v
- Module Configuration
- 1x32GB
- Form Factor
- LRDIMM
View on Amazon: A-Tech 32GB DDR4 2400MHz ECC LRDIMM Affiliate link
This A-Tech 32GB module provides DDR4 server memory operating at 2400MHz and 1.2 volts. Built as a 288-pin load-reduced DIMM (LRDIMM) with a 2Rx4 dual-rank configuration, it is designed for compatible systems such as the Dell PowerEdge R630. It suits you if you need a replacement or expansion module matching Dell part SNP7FKKKC/32G while maintaining ECC load-reduced server memory standards.
Pros
- 32GB capacity running at 2400MHz
- ECC load-reduced (LRDIMM) 2Rx4 architecture
- Operates at standard 1.2V DDR4 power
- Includes manufacturer lifetime warranty and toll-free technical support
Cons
- 2400MHz transfer rate is slower than 2666MHz alternatives on the list
- Incompatible with standard registered RDIMM or unbuffered ECC modules
Good fit if
- You run a Dell PowerEdge R630 or compatible server requiring 2400MHz LRDIMMs.
- You need a 32GB 2Rx4 dual-rank replacement for Dell part SNP7FKKKC/32G.
Skip if
- You use standard registered ECC RDIMMs rather than load-reduced memory.
- You need higher 2666MHz clock speeds or larger 64GB module density.
Verdict: A-Tech 32GB 2400MHz DDR4 ECC LRDIMM fits administrators maintaining Dell PowerEdge R630 servers that require 2Rx4 load-reduced memory matching OEM specifications.
Specifications side by side
| Spec | Kingston 64GB DDR4 ECC REG Server Kit | SK Hynix 16GB DDR4-2133 ECC Registered Server Memory | SK Hynix 32GB DDR4 ECC Registered Server RAM | SK Hynix 32GB DDR4-2400 ECC REG | 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 32GB DDR4-2400 LRDIMM | Nemix RAM 64GB DDR4 2400MHz ECC LRDIMM | Nemix RAM 64GB DDR4 2133MHz ECC LRDIMM | Nemix RAM 64GB DDR4 2666MHz ECC LRDIMM | Samsung 32GB DDR4 ECC RDIMM | A-Tech 32GB DDR4 2400MHz ECC LRDIMM |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total Capacity | 64GB | 16GB | 32 GB | 32GB | 32GB | 16Gb | 64GB | 64GB | 32GB | 32GB | 64GB | 64GB | 64GB | 32GB | 32GB |
| Memory Speed | 2133MHz | 2133 MHz | 2133MHz | 2400MHz | 2400MHz | 2133Mhz | 2666MHz | 2400MHz | 2133MHz | 2400MHz | 2400MHz | 2133MHz | 2666MHz | 2666 MT/s | 2400MHz |
| CAS Latency | CL15 | CL13 | CL15 | not stated | not stated | not stated | CL19 | CL 17 | not stated | CL17 | CL17 | not stated | CL19 | not stated | not stated |
| Voltage | not stated | not stated | not stated | not stated | not stated | not stated | 1.20 V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | not stated | 1.2v |
| Module Configuration | 4x16GB | not stated | not stated | not stated | not stated | 1X16gb | 1x64GB | not stated | 1x32GB | 1x32GB | 1x64GB | 1x64GB | 1x64GB | not stated | 1x32GB |
| Form Factor | DIMM | not stated | not stated | DIMM | not stated | not stated | not stated | Load Reduced | LRDIMM | LRDIMM | LRDIMM | LRDIMM | LRDIMM | RDIMM | LRDIMM |
| ECC Support | ECC Reg | ECC REG | ECC/Reg | ECC REG | LP ECC REG | Ecc Registered | ECC/REG | ECC/REG | ECC | ECC | ECC | ECC | ECC | ECC | ECC Load Reduced |
| Compatible Device | Server | Server | Server | Server | Server | Server | Server | Server | Server | Server | Server | Server | Server | Server | Server |
| Size | 64GB | 16GB | 32GB | 32GB | 32GB | 16GB | 64GB | 64GB | 32GB (1X32GB) DDR4 2133MHZ LRDIMM | 32GB (1X32GB) DDR4 2400MHZ LRDIMM | 64GB (1X64GB) DDR4 2400MHZ LRDIMM | 64GB (1X64GB) DDR4 2133MHZ LRDIMM | 64GB (1X64GB) DDR4 2666MHZ LRDIMM | 32GB | 32GB 2400MHz (PC4-19200) 2Rx4 |
| Dimensions | 13 × 4.5 × 0.1 inches | not stated | not stated | 6 × 1 × 0.2 inches | 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 | not stated | not stated |
| Weight | 0.35 ounces | not stated | not stated | not stated | 1.6 ounces | not stated | not stated | not stated | 4 ounces | 4 ounces | 4 ounces | 4 ounces | 4 ounces | not stated | not stated |
| Color | Multicolor | not stated | not stated | Multicolor | Black | Multicolor | Multicolor | Multicolor | 32GB | 32GB | 64GB | 64GB | 64GB | not stated | Server Module (1 x ECC LRDIMM) |
| Model | KVR21R15D4K4/64 | HMA42GR7MFR4N-TF | not stated | HMA84GR7MFR4N-UH | M393A4K40BB1-CRC | HMA42GR7AFR4N-TF | HMAA8GL7AMR4N-VK | HMAA8GL7MMR4N-UH | ML17000-344K01-106 | ML19200-344K01-129 | ML19200-944K01-102 | ML17000-944K01-105 | ML21300-944K01-103 | M393A4K40BB2-CTD | AT316640SRV-X1L1 |
Before choosing your modules, you can review memory channel and socket specifications across the best motherboards for server.
Choose Server RAM By Key Specs
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Verify ECC Support
All options in this guide feature ECC support, which corrects memory errors automatically. This feature is essential for server environments where data integrity matters more than gaming performance. You do not need to filter for this spec since every listed module includes it. Focus instead on the type of error correction, such as registered or load-reduced designs, to match your motherboard requirements.
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Match Memory Speed
Server platforms typically operate at 2133MHz, 2400MHz, or 2666MHz. The SK Hynix 64GB DDR4 2666MHz ECC Server RAM offers the highest frequency in this list. If your server supports 2666MHz, this module provides faster data transfer rates. However, many enterprise systems are standardized on 2133MHz. Check your server manual to ensure the module speed matches the supported bus speed for stable operation.
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Select Form Factor
You must choose between RDIMM and LRDIMM modules based on your server’s memory controller. The Kingston 64GB DDR4 ECC REG Server Kit is an RDIMM, suitable for standard dual-socket servers. In contrast, the Nemix RAM 64GB DDR4 2400MHz ECC LRDIMM is designed for high-density multi-socket systems. LRDIMMs reduce electrical load on the memory controller, allowing for higher capacities. Using the wrong form factor will prevent the system from booting.
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Check CAS Latency
CAS Latency, or CL, indicates the delay before data is available. Lower numbers mean faster access. The SK Hynix 16GB DDR4-2133 ECC Registered Server Memory features a tight CL13 latency. This is beneficial for workloads requiring quick data retrieval. Other modules, like the SK Hynix 64GB DDR4 2666MHz ECC Server RAM, have a CL19 latency. While higher, this is standard for high-capacity modules. Balance latency against capacity needs for your specific application.
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Determine Capacity Needs
Server memory capacities range from 16GB to 64GB per module. The SK Hynix 16GB DDR4 ECC Server RAM is ideal for entry-level maintenance or modest expansions. For virtualization or database workloads, the Nemix RAM 64GB DDR4 2133MHz ECC LRDIMM provides maximum density per slot. Higher capacity reduces the need for multiple sticks, freeing up slots for future upgrades. Calculate your total required memory and divide by the module size to determine quantity.
Frequently asked questions
What is the highest capacity DDR4 server RAM available in this guide?
The highest capacity modules listed are 64GB sticks. SK Hynix offers 64GB LRDIMMs at 2400MHz and 2666MHz. Nemix also provides 64GB LRDIMMs at 2133MHz, 2400MHz, and 2666MHz. These load-reduced modules are designed for high-density virtualization and database workloads where maximum per-slot memory is critical.
Which DDR4 server RAM has the lowest CAS Latency?
The SK Hynix 16GB DDR4-2133 ECC Registered module features the lowest latency at CL13. This tight timing is beneficial for systems requiring stable registered memory with faster access speeds. Most other listed modules, including 32GB and 64GB options, operate at CL15, CL17, or CL19.
Are all the listed server RAM modules compatible with standard desktop computers?
No. All listed modules are explicitly designated for server use. They utilize ECC, RDIMM, or LRDIMM form factors that standard desktop motherboards typically do not support. You must verify your server hardware accepts these specific enterprise-grade memory types before purchasing to ensure compatibility and proper operation.
What is the difference between RDIMM and LRDIMM server RAM?
RDIMMs, like the Kingston 64GB kit, use a register to buffer address and command signals. LRDIMMs, such as those from SK Hynix and Nemix, use a buffer to reduce the electrical load on the memory controller. LRDIMMs allow for higher memory densities per slot, making them ideal for dense virtualization environments.
Which DDR4 server RAM runs at the highest frequency?
The highest frequency listed is 2666MHz. SK Hynix offers a 64GB LRDIMM at this speed. Nemix also provides 64GB LRDIMMs running at 2666MHz. These modules suit administrators populating high-capacity multi-socket servers that require buffered load-reduced memory for heavy virtualization setups and database workloads.
Does every module in this list support Error Correction Code?
Yes. Every product listed includes ECC support. This feature automatically detects and corrects single-bit memory errors, which is essential for maintaining data integrity in server environments. Whether you choose an RDIMM or LRDIMM, all options provide this error-checking capability to ensure system stability.
Which server RAM is best for upgrading a Dell PowerEdge R630?
The A-Tech 32GB DDR4 2400MHz ECC LRDIMM is specifically noted for Dell PowerEdge R630 servers. It matches the OEM specifications for 2Rx4 load-reduced memory required by this platform. Ensure your server supports LRDIMMs, as standard RDIMMs or unbuffered modules will not function in this specific configuration.