Best ddr5 RAMs with ECC: 15 Spec-Based Picks
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When you evaluate options like ddr5 RAM with ECC, hardware compatibility and stability remain critical. We compared 15 memory products based strictly on the specifications published on their listings.
The SK Hynix 16GB DDR4-2133 ECC Registered Server Memory takes the top spot because it combines a 16GB capacity with CL13 latency for compatible servers. This guide helps you identify the proper module size, operating speed, and form factor for your specific server upgrade.
Quick picks
The best fit for you
- You need low latency CL13 registered DDR4 server memory SK Hynix 16GB DDR4-2133 ECC Registered Server Memory This 16GB module delivers DDR4-2133 speed with CL13 latency for registered ECC server environments.
- You need a dual module DDR4 RDIMM server kit Crucial 64GB (2x32GB) 2666MHz DDR4 RDIMM It provides a 64GB kit with two 32GB 2666MHz registered ECC modules operating at 1.2V.
- You need low voltage DDR3 server load reduced memory NEMIX RAM 32GB DDR3 1600MHz ECC LRDIMM This 32GB LRDIMM module runs at 1.35V and 1600MHz for compatible DDR3 systems.
- You want a single 64GB DDR4 LRDIMM module Nemix RAM 64GB DDR4 2400MHz ECC LRDIMM It delivers 64GB capacity on a single LRDIMM operating at 2400MHz and 1.2V.
Our 15 picks
SK Hynix 16GB DDR4-2133 ECC Registered Server Memory
Best for: DDR4 servers requiring CL13 registered ECC memory
- ECC Support
- ECC (what this guide is about)
- Capacity
- 16GB
- Memory Speed
- 2133MHz
- CAS Latency
- CL13
- Compatible Device
- Server
View on Amazon: SK Hynix 16GB DDR4-2133 ECC Registered Server Memory
This SK Hynix module is a 16GB DDR4 server memory stick operating at 2133 MHz. It features registered error-correcting code (ECC) support along with a CAS latency of CL13. The hardware uses Hynix chips designed specifically for server platforms. You should consider this module if you manage compatible server hardware that demands registered ECC reliability to detect and correct memory errors during continuous enterprise server workloads.
Pros
- Registered ECC error correction support
- Low CAS latency rated at CL13
- 16GB single-module capacity
- DDR4-2133 operating frequency
Cons
- Restricted to compatible server hardware
- DDR4-2133 transfer speed is lower than newer memory standards
Good fit if
- You need 16GB of registered ECC DDR4 memory for a server board.
- You require CL13 latency for a DDR4-2133 server environment.
Skip if
- You need desktop PC memory rather than server-compatible modules.
- You operate platforms requiring DDR5 or faster memory transfer rates.
Verdict: SK Hynix 16GB DDR4-2133 ECC Registered Server RAM delivers dedicated error-correcting memory and CL13 latency for supported server systems. It provides reliable single-module capacity where registered DDR4 stability is essential.
SK Hynix 32GB DDR4 ECC Registered Server RAM
Best for: CL15 DDR4 registered server systems
- ECC Support
- ECC (what this guide is about)
- Capacity
- 32GB
- CAS Latency
- CL15
- Compatible Device
- Server
View on Amazon: SK Hynix 32GB DDR4 ECC Registered Server RAM
This SK Hynix module provides 32GB of DDR4 memory built for server systems. It runs at a DDR4-2133 speed rating and features registered ECC error correction to maintain data integrity across demanding enterprise workloads. With a CAS latency rating of CL15, it matches platforms tuned for low-latency server configurations. It fits your build if you operate compatible DDR4 server hardware requiring high-capacity registered error-checking memory.
Pros
- 32GB capacity module
- ECC error correction support
- Registered memory design
- CL15 CAS latency
Cons
- DDR4-2133 frequency ceiling
- Compatible only with server hardware
Good fit if
- You run a server motherboard that accepts registered DDR4 ECC memory.
- You need 32GB of memory per slot.
- You require low-latency CL15 timing for 2133MHz operations.
Skip if
- You use a standard desktop platform.
- You need higher memory frequencies than DDR4-2133.
Verdict: SK Hynix 32GB DDR4 ECC Registered Server RAM provides 32GB of registered memory with CL15 latency for compatible server setups.
Samsung 32GB DDR4-2400 ECC Registered Server RAM
Best for: Supermicro servers needing low-profile registered DDR4
- ECC Support
- ECC (what this guide is about)
- Capacity
- 32GB
- Memory Speed
- DDR4-2400
- Compatible Device
- Server
- Dimensions
- 6 × 4 × 0.5 inches
- Weight
- 1.6 ounces
View on Amazon: Samsung 32GB DDR4-2400 ECC Registered Server RAM
This Samsung server memory module provides 32GB of DDR4 capacity running at 2400MHz. It features registered ECC support to detect and correct data corruption, making it suitable for stable server operation. The low-profile dual-rank design fits systems requiring compact physical clearance. If you manage a compatible server setup that requires Supermicro-certified ECC registered memory, this 32GB module provides the exact specification required without extra consumer features.
Pros
- 32GB DDR4-2400 capacity
- Registered ECC error correction
- Low-profile physical form factor
- Supermicro certified compatibility
Cons
- DDR4-2400 transfer rate rather than DDR5
- Server-only compatibility incompatible with standard desktop PCs
Good fit if
- You need 32GB registered ECC DDR4 for a server platform.
- You require low-profile memory with Supermicro certification.
Skip if
- You need DDR5 generation memory architecture.
- You are configuring a desktop PC requiring standard unbuffered RAM.
Verdict: Samsung 32GB DDR4-2400 ECC Registered Server Memory delivers certified stability and error correction for compatible server platforms.
SK Hynix 16GB DDR4 ECC Server RAM
Best for: budget-conscious 16GB DDR4 server memory upgrades
- ECC Support
- ECC (what this guide is about)
- Capacity
- 16Gb
- Memory Speed
- 2133Mhz
- Kit Configuration
- 1X16gb
- Compatible Device
- Server
- Dimensions
- 5.25 × 0.16 × 1.21 inches
This SK Hynix module gives you 16GB of DDR4 server memory running at a 2133MHz clock speed. It features registered error-correcting code (ECC) support to maintain data integrity during continuous server operations. Measuring 1.21 inches tall, the module fits standard server slots without obstruction. It suits you if you need an entry-level capacity module to maintain or populate compatible DDR4 server hardware without requiring higher-density 32GB or 64GB sticks.
Pros
- Registered ECC support for data integrity
- Standard 2133MHz DDR4 operating speed
- Low 1.21-inch profile fits standard server slots
Cons
- DDR4 architecture rather than DDR5
- 16GB capacity is lower than 32GB and 64GB alternatives
- Server-only compatibility limits use in desktop systems
Good fit if
- You need a 16GB DDR4 module with registered ECC support.
- You run a server platform built for 2133MHz memory speeds.
Skip if
- You require DDR5 memory architecture.
- You need more than 16GB per DIMM slot.
Verdict: SK Hynix 16GB DDR4 ECC Registered Memory delivers standard 2133MHz operation and error correction for compatible server platforms. It provides reliable baseline capacity when you need server-grade stability without higher density memory modules.
Crucial 64GB (2x32GB) 2666MHz DDR4 RDIMM
Best for: dual-channel registered DDR4 server memory setups
- ECC Support
- ECC (what this guide is about)
- Capacity
- 64GB
- Memory Speed
- 2666 MT/S
- CAS Latency
- CL19
- Kit Configuration
- 2X 32GB
- Form Factor
- 288-Pin RDIMM
This Crucial kit delivers 64GB of memory split across two 32GB 288-pin registered RDIMM modules. It operates at 2666MHz with a CAS latency of CL19 and a standard 1.2V profile. Built-in ECC support provides error detection and correction for compatible systems. If you need a dual-module registered DDR4 memory configuration to expand your total capacity without exceeding standard operating voltage, this kit matches those exact requirements.
Pros
- 64GB total capacity via two 32GB modules
- 2666MHz memory speed with CL19 latency
- Registered RDIMM form factor with ECC support
- Standard 1.2V power profile
Cons
- Uses DDR4 specification rather than DDR5
- Incompatible with motherboards requiring unbuffered DIMMs
Good fit if
- You need a 64GB two-stick DDR4 kit with registered ECC support.
- You want 2666MHz memory speed operating at standard 1.2V.
Skip if
- You require DDR5 memory modules for your platform.
- You use motherboards designed only for unbuffered DIMMs.
Verdict: Crucial 64GB (2x32GB) 2666MHz ECC RDIMM Kit delivers 64GB of error-correcting registered memory at 2666MHz for systems requiring dual-module 1.2V DDR4.
Timetec 32GB DDR4 2666MHz RDIMM
Best for: registered ECC server memory upgrades
- ECC Support
- ECC (what this guide is about)
- Capacity
- 32GB
- Memory Speed
- 2666MHz
- CAS Latency
- CL19
- Kit Configuration
- 1x32GB
- Form Factor
- 288 Pin RDIMM
The Timetec 32GB DDR4 2666MHz ECC RDIMM is a single-module memory upgrade built for compatible server systems. Operating at 2666MHz with a CL19 CAS latency and 1.2V supply, it delivers registered error-correcting code capability across a dual-rank 2Rx4 design. If you manage a server platform that accepts 288-pin registered memory and requires 32GB modules to scale capacity, this module matches your hardware.
Pros
- Registered ECC support for server data integrity
- Standard 1.2V low operating voltage
- Dual-rank 2Rx4 288-pin design
- Includes manufacturer lifetime warranty
Cons
- Incompatible with desktop PCs and laptops
- Restricted to servers supporting registered RDIMMs
- CL19 CAS latency specification
Good fit if
- You need a 32GB 2666MHz module for an ECC-capable server.
- You run hardware that requires 288-pin 1.2V registered RDIMMs.
Skip if
- You need RAM for a standard desktop computer or laptop.
- You require unbuffered ECC memory or newer DDR5 platforms.
Verdict: Timetec 32GB DDR4 2666MHz ECC RDIMM delivers registered ECC reliability, 2666MHz speed, and standard 1.2V operation for compatible server configurations.
SK Hynix 16GB DDR4 2400MHz ECC RDIMM
Best for: servers needing 16GB 2400MHz registered ECC memory
- ECC Support
- ECC (what this guide is about)
- Capacity
- 16GB
- Memory Speed
- 2400
- CAS Latency
- CL17
- Form Factor
- 288-PIN RDIMM
- Voltage
- 1.2V
This SK Hynix module gives you 16GB of DDR4 memory engineered for systems requiring registered memory. It operates at 2400MHz with a CAS latency of CL17 and uses a standard 1.2V supply. Built in a 288-pin RDIMM form factor with ECC support, it provides essential error correction for compatible hardware. You will find it fits workstations or servers designed specifically for registered DDR4 memory rather than standard unbuffered consumer slots.
Pros
- Includes ECC support for error correction
- Registered 288-pin RDIMM form factor
- Standard 1.2V operating voltage
- CL17 latency at DDR4-2400 speed
Cons
- 16GB capacity is lower than larger server modules
- Incompatible with desktop motherboards requiring unbuffered UDIMMs
- 2400MHz speed is slower than 2666MHz alternatives
Good fit if
- You need a 16GB DDR4 module with registered ECC support.
- You operate server hardware designed for 288-pin 1.2V RDIMMs.
Skip if
- You need standard unbuffered RAM for a mainstream consumer desktop.
- You require 32GB or higher capacity on a single stick.
Verdict: SK Hynix 16GB DDR4 ECC RDIMM delivers reliable registered ECC performance at 2400MHz and 1.2V for compatible servers. It serves as a dependable baseline module when you do not need high-density capacities.
SK Hynix 64GB DDR4 2666MHz ECC Server RAM
Best for: high-capacity DDR4 server memory expansions
- ECC Support
- ECC (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 memory stick designed for server platforms. It operates at 2666MHz with a CAS latency of CL19 and runs on a standard 1.20V power draw. Built with error-correcting code support, this load-reduced server memory suits your system if you need high density per socket and continuous stability.
Pros
- 64GB capacity on a single module
- 2666MHz operating frequency
- ECC support for data integrity
- Standard 1.20V low-voltage operation
Cons
- High CAS latency rated at CL19
- Compatible only with server hardware
- Single-module packaging without paired multi-channel sticks
Good fit if
- You need a dense 64GB DDR4 module for an ECC-supported server.
- You require 2666MHz speed operating at standard 1.20V.
Skip if
- You need memory for a standard consumer desktop motherboard.
- You want lower memory latency timings than CL19.
Verdict: SK Hynix 64GB DDR4 2666MHz ECC Server RAM provides substantial memory density and error-correction capabilities for compatible server systems. Its 2666MHz speed and 1.20V power profile deliver steady, high-capacity performance.
SK Hynix 64GB DDR4 2400MHz ECC LRDIMM
Best for: High-density DDR4 server memory expansion
- ECC Support
- ECC (what this guide is about)
- Capacity
- 64GB
- Memory Speed
- 2400MHz
- CAS Latency
- CL 17
- Form Factor
- 288 Pin
- Voltage
- 1.2V
This SK Hynix memory module gives you 64GB of DDR4 capacity running at 2400MHz with CL17 latency. It uses a 288-pin load-reduced design with a 4Rx4 quad-rank layout and standard 1.2V power draw. Built specifically for server motherboards that support ECC and LRDIMMs, it suits you if you need dense single-module memory for high-capacity server builds.
Pros
- 64GB capacity on a single 288-pin module
- ECC support for memory error handling
- CL17 CAS latency at 2400MHz speed
- Load-reduced 4Rx4 quad-rank configuration
Cons
- Compatible only with server hardware supporting LRDIMMs
- Limited to 2400MHz memory speed
Good fit if
- You need 64GB of ECC memory in a single slot.
- You operate a server motherboard designed for DDR4 LRDIMMs.
Skip if
- You use a desktop motherboard that does not support LRDIMMs.
- You require speeds higher than 2400MHz.
Verdict: SK Hynix 64GB DDR4 2400MHz ECC LRDIMM Server RAM delivers high memory density with CL17 latency for enterprise environments. It provides reliable ECC operation for compatible server boards requiring load-reduced modules.
Nemix RAM 32GB DDR4 2133MHz ECC LRDIMM
Best for: high-density DDR4 server memory expansions
- ECC Support
- ECC (what this guide is about)
- Capacity
- 32GB
- Memory Speed
- 2133MHz
- Kit Configuration
- 1x32GB
- Form Factor
- 288-pin LRDIMM
- Voltage
- 1.2V
This Nemix RAM module provides 32GB of DDR4 memory running at 2133MHz. Built as a 288-pin load-reduced DIMM (LRDIMM) with a 4Rx4 rank design, it operates at 1.2V and includes ECC support. Load reduction lowers electrical bus load for high-density setups. You will find it suitable if your multi-socket server or workstation motherboard requires DDR4 LRDIMM modules for memory-intensive workloads.
Pros
- Load-reduced (LRDIMM) design lowers electrical load on the bus
- 32GB capacity with quad-rank 4Rx4 layout
- Standard 1.2V operating voltage
- Backed by a lifetime replacement warranty
Cons
- Operates at a base DDR4 speed of 2133MHz
- Not compatible with boards requiring standard RDIMMs or UDIMMs
- Requires platform support specifically for 4Rx4 LRDIMM configurations
Good fit if
- You need a 32GB DDR4-2133 ECC LRDIMM for a compatible server or workstation.
- You want 4Rx4 quad-rank memory to populate high-density server channels.
- You run server platforms configured for 1.2V memory operation.
Skip if
- You require standard unbuffered UDIMM or registered RDIMM memory.
- You need memory speeds higher than 2133MHz.
- You are building a standard desktop system that lacks LRDIMM support.
Verdict: Nemix RAM 32GB DDR4-2133 ECC LRDIMM delivers high-density server memory scaling using a 4Rx4 load-reduced architecture at 1.2V. It is a solid choice when your server board specifically requires 2133MHz DDR4 LRDIMM modules.
Nemix RAM 32GB DDR3 1866MHz LRDIMM
Best for: legacy DDR3 server memory upgrades
- ECC Support
- ECC (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 provides 32GB of memory using a DDR3 1866MHz interface on a 240-pin load-reduced form factor. Operating at 1.5V with a 4Rx4 rank configuration, it includes ECC protection designed to prevent memory errors in server environments. It suits you if you need to maintain or upgrade an existing multi-socket DDR3 server requiring high-density LRDIMM modules rather than standard registered or unbuffered memory.
Pros
- 32GB capacity on a single 240-pin module
- ECC support with load-reduced buffering for lower bus load
- Runs at 1866MHz (PC3-14900) speed
- Quad rank (4Rx4) configuration
Cons
- Operates at 1.5V rather than lower modern DDR voltages
- LRDIMM design is incompatible with boards requiring standard RDIMM or UDIMM
- Built on older DDR3 architecture instead of newer memory standards
Good fit if
- You manage a server platform that explicitly supports 240-pin DDR3 LRDIMMs.
- You need a single 32GB 4Rx4 module running at 1866MHz.
- You require load-reduced memory to handle high-DIMM-count configurations.
Skip if
- You have a system requiring DDR4 or DDR5 memory.
- You run a motherboard that only accepts standard unbuffered or registered DIMMs.
Verdict: Nemix RAM 32GB DDR3 1866MHz ECC LRDIMM delivers high-density ECC memory designed specifically for compatible DDR3 server boards. It is a solid choice if your hardware calls for 1.5V 4Rx4 load-reduced modules.
Nemix RAM 64GB DDR4 2400MHz ECC LRDIMM
Best for: dense DDR4 server virtualization builds
- ECC Support
- ECC (what this guide is about)
- Capacity
- 64GB
- Memory Speed
- 2400MHz
- CAS Latency
- CL17
- Kit Configuration
- 1x64GB
- Form Factor
- 288-pin LRDIMM
This Nemix module provides 64GB of DDR4 memory running at 2400MHz with a CL17 latency. It features error-correcting code (ECC) and a 288-pin load-reduced DIMM (LRDIMM) design operating at 1.2V. The 4Rx4 quad-rank buffering lowers bus load in multi-slot boards. You will find this module suitable if you manage servers or workstations handling virtualization and memory-heavy workloads that require high-density ECC memory.
Pros
- High 64GB single-module capacity
- Load-reduced LRDIMM design lowers electrical bus load
- Standard 1.2V low-voltage operation
- Covered by a lifetime replacement warranty
Cons
- Uses DDR4 specification rather than DDR5
- Incompatible with systems requiring RDIMMs or unbuffered DIMMs
- Operates at a moderate 2400MHz frequency with CL17 timing
Good fit if
- You need 64GB single-stick capacity in an LRDIMM-supported server board.
- You run enterprise workloads that require quad-rank 1.2V ECC memory.
Skip if
- You require faster DDR5 memory for a newer architecture.
- You have a motherboard wired only for standard registered RDIMMs or UDIMMs.
Verdict: Nemix 64GB DDR4-2400 ECC LRDIMM delivers high-capacity, error-correcting server memory designed to minimize electrical bus strain in dense multi-socket boards. It is a dependable choice for platforms certified for quad-rank DDR4 LRDIMMs.
NEMIX RAM 32GB DDR3 1600MHz ECC LRDIMM
Best for: 1.35V DDR3 server and workstation upgrades
- ECC Support
- ECC (what this guide is about)
- Capacity
- 32GB
- Memory Speed
- 1600MHz
- Kit Configuration
- 1x32GB
- Form Factor
- 240-pin LRDIMM
- Voltage
- 1.35V
This single-module 32GB server memory upgrade runs at DDR3 1600MHz with error-correcting code (ECC) support. It operates at 1.35V and uses a 240-pin load-reduced DIMM (LRDIMM) design with a 4Rx4 rank configuration. If your server or workstation motherboard requires low-voltage DDR3 LRDIMMs to reduce bus electrical load in dense memory configurations, this module gives you registered ECC stability and memory density for heavy multi-socket workloads.
Pros
- Operates at a low 1.35V voltage level
- LRDIMM design lowers electrical load on the memory bus
- ECC support detects and corrects memory errors
- Includes a manufacturer lifetime replacement warranty
Cons
- Uses older DDR3 generation speed capped at 1600MHz
- Incompatible with standard RDIMM or UDIMM slots
- Quad-rank 4Rx4 configuration requires specific platform and BIOS support
Good fit if
- You need a 1.35V 32GB DDR3 module for a compatible server motherboard.
- You require 240-pin LRDIMM buffering to maximize capacity across dense memory channels.
Skip if
- You require DDR4 or DDR5 system memory.
- Your motherboard only accepts unbuffered UDIMM or standard RDIMM modules.
Verdict: Nemix RAM 32GB DDR3 1600MHz ECC LRDIMM delivers high-density server memory with 1.35V operation and ECC reliability. It is built specifically for systems requiring 240-pin quad-rank load-reduced modules.
Nemix RAM 32GB DDR3 1600MHz LRDIMM
Best for: legacy DDR3 servers requiring load-reduced memory
- ECC Support
- ECC (what this guide is about)
- Capacity
- 32GB
- Memory Speed
- 1600MHz
- Kit Configuration
- 1x32GB
- Form Factor
- 240-pin LRDIMM
- Voltage
- 1.5V
This is a single 32GB Nemix RAM module engineered for server setups that need load-reduced memory. It operates at 1600MHz on DDR3 architecture with 1.5V power consumption and 4Rx4 rank configuration. The 240-pin LRDIMM design reduces the electrical load on your memory bus to support dense multi-socket installations. If your server motherboard specifically requires DDR3 LRDIMMs rather than standard registered modules, this module provides ECC-protected capacity for you.
Pros
- 32GB density on a single 240-pin module
- Load-reduced (LRDIMM) design lowers memory bus electrical load
- ECC error-correction support for server reliability
- Quad-rank 4Rx4 configuration running at 1600MHz
Cons
- Uses DDR3 generation instead of DDR4 or DDR5
- Requires 1.5V operating voltage rather than 1.35V or 1.2V
- Incompatible with boards requiring standard RDIMM or UDIMM modules
Good fit if
- You maintain an older server platform that requires 240-pin DDR3 LRDIMM memory.
- You need a single 32GB 4Rx4 module running at 1600MHz and 1.5V.
- You want load-reduced memory to maximize capacity in high-DIMM-count server channels.
Skip if
- You run modern server hardware that requires DDR4 or DDR5 modules.
- You need standard unbuffered (UDIMM) or registered (RDIMM) memory.
- You require low-voltage 1.35V or 1.2V memory support.
Verdict: Nemix RAM 32GB DDR3 1600MHz ECC LRDIMM delivers dense load-reduced memory for compatible legacy server platforms requiring 4Rx4 modules at 1.5V. It ensures stable multi-socket operation with dedicated ECC protection.
Nemix RAM 64GB DDR4 2133MHz ECC LRDIMM
Best for: high-density DDR4 server and virtualization workloads
- ECC Support
- ECC (what this guide is about)
- Capacity
- 64GB
- Memory Speed
- 2133MHz
- Kit Configuration
- 1x64GB
- Form Factor
- 288-pin LRDIMM
- Voltage
- 1.2V
You get a single 64GB DDR4 server memory module running at 2133MHz on 1.2 volts. It uses a 288-pin load-reduced LRDIMM design with 4Rx4 rank composition and full ECC error checking. This architecture reduces electrical loading on the memory bus, making it suitable if you build or expand high-capacity, multi-socket virtualization hosts or database servers requiring large pools of verified memory.
Pros
- 64GB capacity on a single 288-pin module
- Load-reduced LRDIMM buffer reduces memory bus electrical load
- Includes ECC error correction for server stability
- Standard 1.2V operating voltage
Cons
- Requires an LRDIMM-compatible motherboard; incompatible with standard UDIMM or RDIMM slots
- Base DDR4 speed rated at 2133MHz
Good fit if
- You operate high-density server boards that require 288-pin LRDIMMs.
- You need a single 64GB 4Rx4 DDR4 module operating at 2133MHz and 1.2V.
Skip if
- You run consumer motherboards or standard desktop platforms that only accept UDIMMs.
- You need faster memory speeds above 2133MHz for your DDR4 or DDR5 system.
Verdict: Nemix RAM 64GB DDR4 2133MHz ECC LRDIMM supplies high-density server memory designed to lower bus loads across multi-socket configurations. It delivers verified ECC stability for systems built around 2133MHz DDR4 LRDIMM specifications.
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 | Crucial 64GB (2x32GB) 2666MHz DDR4 RDIMM | Timetec 32GB DDR4 2666MHz RDIMM | SK Hynix 16GB DDR4 2400MHz ECC RDIMM | 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 DDR4 2400MHz ECC LRDIMM | NEMIX RAM 32GB DDR3 1600MHz ECC LRDIMM | Nemix RAM 32GB DDR3 1600MHz LRDIMM | Nemix RAM 64GB DDR4 2133MHz ECC LRDIMM |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Capacity | 16GB | 32GB | 32GB | 16Gb | 64GB | 32GB | 16GB | 64 GB | 64GB | 32GB | 32GB | 64GB | 32GB | 32GB | 64GB |
| Memory Speed | 2133MHz | not specified | DDR4-2400 | 2133Mhz | 2666 MT/S | 2666MHz | 2400 | 2666 MHz | 2400MHz | 2133MHz | 1866MHz | 2400MHz | 1600MHz | 1600MHz | 2133MHz |
| CAS Latency | CL13 | CL15 | not specified | not specified | CL19 | CL19 | CL17 | CL 19 | CL 17 | not specified | not specified | CL17 | not specified | not specified | not specified |
| Kit Configuration | not specified | not specified | not specified | 1X16gb | 2X 32GB | 1x32GB | not specified | 1 x 64GB | not specified | 1x32GB | 1x32GB | 1x64GB | 1x32GB | 1x32GB | 1x64GB |
| Form Factor | not specified | not specified | not specified | not specified | 288-Pin RDIMM | 288 Pin RDIMM | 288-PIN RDIMM | not specified | 288 Pin | 288-pin LRDIMM | 240-pin LRDIMM | 288-pin LRDIMM | 240-pin LRDIMM | 240-pin LRDIMM | 288-pin LRDIMM |
| Voltage | not specified | not specified | not specified | not specified | 1.2V | 1.2V | 1.2V | 1.20 V | 1.2V | 1.2V | 1.5V | 1.2V | 1.35V | 1.5V | 1.2V |
| ECC Support | ECC/REG | ECC/Reg | ECC Reg | Ecc Registered | ECC, Registered | Registered ECC | ECC REG RDIMM | ECC/REG | ECC | ECC | ECC | ECC | ECC | ECC | ECC |
| Compatible Device | Server | Server | Server | Server | not specified | Server | not specified | Server | Server | Server | Server | Server | Server | Server | Server |
| Size | 16GB | 32GB | 32GB | 16GB | not specified | 32GB 2R4 | 16GB | 64GB | 64GB | 32GB (1X32GB) DDR4 2133MHZ LRDIMM | 32GB | 64GB (1X64GB) DDR4 2400MHZ LRDIMM | 32GB (1X32GB) DDR3 1600MHZ LRDIMM | 32GB (1X32GB) DDR3 1600MHZ LRDIMM | 64GB (1X64GB) DDR4 2133MHZ LRDIMM |
| Dimensions | not specified | not specified | 6 × 4 × 0.5 inches | 5.25 × 0.16 × 1.21 inches | 1.97 × 0.98 × 0.39 inches | not specified | not specified | 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 |
| Weight | not specified | not specified | 1.6 ounces | not specified | 0.8 ounces | not specified | not specified | not specified | not specified | 4 ounces | 4 ounces | 4 ounces | 4 ounces | 4 ounces | 4 ounces |
| Model | HMA42GR7MFR4N-TF | not specified | M393A4K40BB1-CRC | HMA42GR7AFR4N-TF | CT2K32G4RFD4266 | not specified | 8541593987 | HMAA8GL7AMR4N-VK | HMAA8GL7MMR4N-UH | ML17000-344K01-106 | ML14900-344K01-37 | ML19200-944K01-102 | ML12800-344LK01-36 | ML12800-344K01-35 | ML17000-944K01-105 |
| Color | not specified | not specified | Black | Multicolor | not specified | DDR4 2666MHz | Multicolor | Multicolor | Multicolor | 32GB | 32GB | 64GB | Black | Black | 64GB |
Is ECC Memory Worth It for Your Setup?
ECC support provides dedicated error correction designed for server platforms and virtualization builds. Modules with this specification deliver certified stability during continuous operation across single-socket and dense multi-socket configurations. In daily use, ECC works alongside registered RDIMM and load-reduced LRDIMM designs to maintain steady memory performance. Because these listed modules are designed specifically for compatible server hardware, ECC is essential if your system board requires error-correcting modules to function. It ensures dependable baseline operation.
Worth it if
- You operate a server platform requiring registered or load-reduced error-correcting memory.
- You manage virtualization setups or multi-socket boards built for verified stability.
Skip it if
- You run standard consumer desktop systems that do not accept registered server memory.
- You build hardware configurations that do not specify RDIMM or LRDIMM support.
If you run unbuffered ECC modules without factory spreaders, compare thermal dimensions among the best heatsinks for RAM to manage operating temperatures.
How We Picked ECC RAM
To select memory modules for this guide, we identified models where listings explicitly state ECC support in the title or feature specifications. You see only one size or variant per product family to keep the focus clear. All details come directly from published manufacturer specifications, and products are not physically handled.
On this page, products in stock appear first. You can compare published technical specifications such as memory speed, form factor, CAS latency, and operating voltage to verify compatibility with your motherboard. Availability details update live at least daily on the page, helping you review 15 qualifying picks for your system.
How to Choose the Right ECC Memory
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Check Supported Memory Speed
Your motherboard and processor determine the maximum memory clock speed your server can handle. Supported speeds across listed modules include 1600MHz, 1866MHz, 2133MHz, 2400MHz, and 2666MHz. Choosing a frequency faster than your system supports will cause the memory to downclock to your board limits. If your server platform requires a baseline 2400MHz clock, you can look at options like the SK Hynix 16GB DDR4 2400MHz ECC RDIMM. Always confirm your CPU memory controller specifications before selecting a specific frequency.
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Evaluate CAS Latency Ratings
CAS latency, labeled as CL, measures the delay in clock cycles before memory delivers requested data. Lower latency numbers indicate fewer cycles of delay between read commands. Listed server memory includes ratings such as CL13, CL15, CL17, and CL19. If your server workloads benefit from tighter access timing at DDR4 speeds, consider the SK Hynix 32GB DDR4 ECC Registered Server RAM, which provides a CL15 specification. Make sure all installed memory channels use matching latency values to maintain uniform timing across your hardware.
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Verify Memory Generation Standards
You must match the DDR standard supported by your motherboard chipset. DDR3 and DDR4 modules are physically and electrically incompatible due to differing pin counts and notch placements. You cannot insert a DDR3 module into a DDR4 motherboard slot or vice versa. If you maintain older enterprise hardware that specifies 1866MHz DDR3 memory, the Nemix RAM 32GB DDR3 1866MHz LRDIMM matches those legacy requirements. Always inspect your motherboard manual or manufacturer specifications to identify whether you need DDR3 or DDR4 modules.
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Plan Density Per Slot
Server motherboards have finite memory slots and maximum capacity caps per channel. When planning your installation, check module capacity options, which range from 16GB up to 64GB per stick. Selecting higher-density individual modules lets you leave expansion slots open for future capacity without removing existing hardware. For a balanced setup requiring moderate density in an individual slot, consider the Samsung 32GB DDR4-2400 ECC Registered Server RAM. Verify the maximum capacity supported per slot in your motherboard documentation before ordering dense modules.
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Choose Single Sticks or Kits
You can buy server RAM as single modules or multi-module kits. Multi-channel architectures require matching modules across specific slots to maximize memory bandwidth across the bus. Installing a matched pair guarantees identical specifications and production tolerances. For example, the Crucial 64GB (2x32GB) 2666MHz DDR4 RDIMM arrives as a factory-paired set of two 32GB modules. If you need to populate multiple slots simultaneously for dual-channel operation, picking a pre-packaged multi-module kit ensures consistent timing, voltage, and latency across paired channels.
Frequently asked questions
Does DDR5 RAM include full ECC support by default?
No, standard consumer DDR5 includes only on-die ECC, which differs from full side-band ECC. On-die ECC corrects bit flips inside individual memory chips. Full ECC requires dedicated physical memory chips to detect and correct transmission errors across the memory bus. If you run critical workloads or server hardware, you need modules specifically specified with full ECC support.
Can you install DDR4 or DDR3 ECC memory into a DDR5 slot?
No, DDR3, DDR4, and DDR5 memory modules are physically and electrically incompatible. Each generation features a different pin count, notch position, and operating voltage. For example, DDR4 RDIMMs like the Timetec 32GB 2666MHz module run at 1.2V, whereas DDR3 LRDIMMs operate at 1.35V or 1.5V. You cannot seat or power older generation modules in a motherboard designed for newer memory slots.
What is the difference between RDIMM and LRDIMM server RAM?
RDIMMs use a register to buffer control signals, while LRDIMMs buffer both control and data lines using a memory buffer. This difference allows load-reduced modules like the Nemix RAM 64GB DDR4-2400 LRDIMM to reduce electrical loading on the memory bus. You can achieve higher overall capacities in multi-socket systems with LRDIMMs, but you should not mix RDIMM and LRDIMM form factors on the same motherboard.
What does CAS latency mean for ECC server RAM?
CAS latency measures the delay in clock cycles between sending a read command and receiving the data. Lower numbers mean fewer cycles between operations. For instance, the SK Hynix DDR4-2133 registered module features CL13 latency, whereas 2666MHz DDR4 modules like the Crucial 64GB kit specify CL19. You balance clock speed against CAS latency to evaluate how quickly memory responds to requests under heavy server loads.
What operating voltages do ECC server memory modules require?
Operating voltages depend strictly on memory generation and module specifications. Most DDR4 server modules, including 16GB and 64GB SK Hynix RDIMMs, operate at a standard 1.2V profile. Older DDR3 modules require higher power delivery. For example, Nemix RAM DDR3 LRDIMMs specify either 1.35V or 1.5V configurations. You must confirm that your system motherboard and memory slots supply the exact voltage rating listed for your chosen modules.
Can you mix different memory speeds in the same server?
Yes, but all modules will downclock to match the slowest installed memory speed. If you pair a 2666MHz Crucial module with a 2133MHz SK Hynix module, your system runs all memory channels at 2133MHz. Running mismatched speeds can also cause timing or latency conflicts in sensitive enterprise hardware. To maintain consistent performance and stability across memory channels, you should install modules with identical clock speeds and timings.
How does single-module RAM compare to multi-module kits?
Multi-module kits allow your motherboard to activate dual-channel memory architecture, which doubles theoretical data transfer bandwidth. A dual-module kit like the Crucial 64GB set splits capacity across two 32GB sticks. Single-module options, such as the Samsung 32GB DDR4-2400 module, operate in single-channel mode unless paired with another stick. You get higher bandwidth with multi-module configurations, while single modules leave open memory slots for future capacity expansion.