Best A-Tech DDR4 RAMS with ECC in 2026: 15 Picks
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Finding the best a tech ddr4 RAMs with ECC requires checking exact server compatibility. We compared 15 modules based strictly on published specifications. Our top pick is the A-Tech 32GB DDR4 2400MHz ECC LRDIMM. It leads because it offers single-module load-reduced memory expansion for Dell PowerEdge R630 systems. This guide helps you decide which form factor and speed match your hardware. You can choose between RDIMM, LRDIMM, or UDIMM types. Each option serves specific enterprise needs. Review the specs to find your ideal server memory upgrade.
Quick picks
The best fit for you
- You need a single LRDIMM for Dell PowerEdge R630 A-Tech 32GB DDR4 2400MHz ECC LRDIMM It is a 32GB 2400MHz ECC LRDIMM designed for load-reduced memory expansion.
- You require high-capacity expansion for Dell PowerEdge R640 A-Tech 128GB DDR4 2400MHz LRDIMM This 128GB 2400MHz ECC LRDIMM kit provides substantial stable memory density.
- You want budget-friendly unbuffered ECC memory for repairs A-Tech 16GB DDR4 2400MHz ECC UDIMM It offers 16GB 2400MHz ECC UDIMM for systems mandating unbuffered modules.
- You need exact compatibility with Samsung M393A4K40BB0-CPB A-Tech 32GB DDR4-2133 ECC RDIMM This 32GB 2133MHz ECC RDIMM matches the older Samsung replacement model.
Our 15 picks
A-Tech 32GB DDR4 2400MHz ECC LRDIMM
Best for: Dell PowerEdge R630 load-reduced memory upgrades
- ECC Support
- ECC (what this guide is about)
- Total Capacity
- 32GB
- Memory Speed
- 2400MHz
- Voltage
- 1.2v
- Module Configuration
- 1x32GB
- Form Factor
- LRDIMM
This A-Tech 32GB memory module delivers DDR4 speeds of 2400MHz at 1.2 volts for server setups. It features a 288-pin Load Reduced DIMM design with dual-rank 2Rx4 architecture and ECC support. If you manage a Dell PowerEdge R630 server requiring load-reduced memory, this single module gives you stable capacity without mixing incompatible module ranks or types.
Pros
- 2400MHz operating speed at standard 1.2V DDR4 power draw
- 288-pin load-reduced LRDIMM build with 2Rx4 dual-rank layout
- Lifetime warranty with toll-free technical support included
Cons
- 2400MHz frequency is lower than 2666MHz or 3200MHz DDR4 alternatives
- Incompatible with standard registered RDIMM or unbuffered ECC configurations
Good fit if
- You run a Dell PowerEdge R630 server configured for 2400MHz LRDIMMs.
- You need a single 32GB 2Rx4 load-reduced module to match existing memory.
Skip if
- You have a system populated with standard ECC registered RDIMM modules.
- You require faster transfer speeds such as 2666MHz or 3200MHz.
Verdict: A-Tech 32GB DDR4 2400MHz ECC LRDIMM fits Dell PowerEdge R630 administrators who need single-module load-reduced memory expansion.
A-Tech 16GB DDR4 2666MHz ECC RDIMM
Best for: standard 16GB server memory replacements
- ECC Support
- ECC (what this guide is about)
- Total Capacity
- 16GB
- Memory Speed
- 2666 MHz
- Voltage
- 1.2V
- Module Configuration
- 1x16GB
- Form Factor
- RDIMM
This module is a single 16GB registered memory stick designed for systems that support DDR4 ECC RDIMMs. It operates at 2666MHz with a standard 1.2V draw across a 288-pin interface. You get error-correcting code capability to protect against data corruption. It suits you if you need a 16GB RDIMM replacement for compatible enterprise workstations or servers.
Pros
- DDR4 2666MHz (PC4-21300) operating speed
- ECC Registered (RDIMM) error correction
- Standard 1.2V operating voltage
- Standard 288-pin server form factor
Cons
- 16GB capacity is lower than the 32GB and 128GB alternatives on the list
- 2666MHz frequency is slower than 2933MHz or 3200MHz DDR4 options
- Registered RDIMM design is incompatible with standard unbuffered desktop systems
Good fit if
- You need a direct 16GB DDR4 ECC RDIMM replacement running at 2666MHz.
- You have a server or workstation motherboard configured for 1.2V 288-pin registered memory.
Skip if
- You require higher memory density per slot, such as 32GB modules.
- You use a desktop motherboard that requires unbuffered (UDIMM) memory.
Verdict: A-Tech 16GB DDR4 2666MHz ECC RDIMM delivers standard 2666MHz registered error-correcting memory for compatible 288-pin server builds. It fits administrators needing an exact single-stick 16GB replacement without moving to higher-capacity modules.
A-Tech 32GB DDR4-2133 ECC RDIMM
Best for: Samsung M393A4K40BB0-CPB replacement
- ECC Support
- ECC (what this guide is about)
- Total Capacity
- 32GB
- Memory Speed
- 2133 MHz
- Voltage
- 1.2V
- Module Configuration
- 1x32GB
- Form Factor
- RDIMM
This A-Tech module provides 32 GB of DDR4 memory running at 2133 MHz. It uses the RDIMM form factor and supports ECC to help maintain data integrity. The kit operates at a standard 1.2V voltage. You should choose this if your system requires 2Rx4 dual rank memory. It serves as a direct replacement for the Samsung M393A4K40BB0-CPB part number.
Pros
- 32 GB capacity
- 2133 MHz speed
- ECC support
- RDIMM form factor
Cons
- 2133 MHz speed is slower than many other options
- Single module only
- Limited to 2Rx4 rank configuration
Good fit if
- You need a direct replacement for Samsung M393A4K40BB0-CPB
- Your server supports 2133 MHz memory
- You require ECC RDIMM technology
Skip if
- You need speeds higher than 2133 MHz
- You require UDIMM or LRDIMM modules
- You are building a system that does not support ECC
Verdict: A-Tech 32GB DDR4 2133MHz ECC RDIMM is a solid choice for users needing exact compatibility with Samsung M393A4K40BB0-CPB. It fits well in older or specific server builds that rely on 2133 MHz speeds.
A-Tech 32GB DDR4 2666MHz ECC RDIMM
Best for: 2666MHz ECC registered server upgrades
- ECC Support
- ECC (what this guide is about)
- Total Capacity
- 32GB
- Memory Speed
- 2666 MHz
- Voltage
- 1.2V
- Module Configuration
- 1x32GB
- Form Factor
- RDIMM
This module provides you with 32GB of DDR4 memory running at 2666MHz on a 1.2V profile. Built in a 288-pin RDIMM form factor, it features ECC registered support and a 2Rx4 dual-rank configuration for server stability. It suits you if your server or workstation requires a 2666MHz registered DIMM to replace a matching Samsung module.
Pros
- 32GB capacity on a single 288-pin module
- 2666MHz operating speed (PC4-21300)
- Registered ECC (RDIMM) data protection
- Standard 1.2V DDR4 power draw
Cons
- Runs at 2666MHz, lower than 2933MHz or 3200MHz DDR4 options
- Single module size is limited to 32GB rather than 64GB
Good fit if
- You need a 32GB 2666MHz ECC registered replacement module.
- You maintain hardware requiring 288-pin 1.2V RDIMMs.
Skip if
- You need higher data transfer speeds like 2933MHz or 3200MHz.
- You require multi-module kits or higher-density 64GB modules.
Verdict: A-Tech 32GB DDR4 2666MHz ECC RDIMM serves enterprise users who need a direct 1.2V replacement module for platforms calibrated to 2666MHz registered memory.
A-Tech 32GB DDR4 2400MHz ECC RDIMM
Best for: 2400MHz DDR4 server and workstation upgrades
- ECC Support
- ECC (what this guide is about)
- Total Capacity
- 32GB
- Memory Speed
- 2400MHz
- Voltage
- 1.2V
- Module Configuration
- 1x32GB
- Form Factor
- RDIMM
This single 32GB A-Tech module provides DDR4 memory running at 2400MHz with standard 1.2V operation. Built as an ECC registered RDIMM with a dual-rank 2Rx4 configuration, it detects and corrects data errors for stability. It suits you if you need to expand memory capacity in compatible dual-rank DDR4 server or workstation motherboards.
Pros
- 32GB density on a single 288-pin module
- ECC Registered RDIMM architecture corrects data errors
- Standard JEDEC 1.2V operating voltage
- Covered by a limited lifetime warranty
Cons
- 2400MHz speed is lower than 2666MHz and 3200MHz alternatives
- Incompatible with standard desktop PCs and laptops
Good fit if
- You need a 32GB dual-rank 2Rx4 ECC RDIMM module for a server.
- You run a DDR4 workstation configured for 2400MHz memory speeds.
Skip if
- You need memory for a standard desktop PC or laptop computer.
- You run existing unbuffered ECC or load-reduced (LRDIMM) memory modules.
Verdict: A-Tech 32GB DDR4 2400MHz ECC RDIMM provides reliable dual-rank capacity for system builders maintaining dedicated DDR4 servers requiring 2400MHz registered memory.
A-Tech 128GB (2x64GB) DDR4 2933MHz ECC LRDIMM
Best for: High-capacity enterprise server memory expansion
- ECC Support
- ECC (what this guide is about)
- Total Capacity
- 128GB
- Memory Speed
- 2933MHz
- Voltage
- 1.2V
- Module Configuration
- 2x64GB
- Form Factor
- LRDIMM
View on Amazon: A-Tech 128GB (2x64GB) DDR4 2933MHz ECC LRDIMM
This two-module server kit provides 128GB of quad-rank memory operating at 2933MHz and 1.2V. Built as load-reduced DIMMs (LRDIMMs), these 288-pin modules reduce electrical load on server memory controllers during high-capacity tasks. This setup suits you if you maintain compatible DDR4 enterprise servers and need high-density memory for heavy data processing workloads.
Pros
- Total capacity of 128GB split across two 64GB modules
- Load-reduced LRDIMM design reduces memory bus loading
- Runs at 2933MHz on standard 1.2V JEDEC power
- Backed by a limited lifetime warranty
Cons
- Incompatible with desktop PCs, laptops, and client motherboards
- Cannot mix with ECC Registered (RDIMM) or unbuffered modules
- Operates at 2933MHz rather than 3200MHz
Good fit if
- You need a high-density 128GB capacity across two server DIMM slots.
- You run enterprise server boards that require ECC LRDIMMs.
- You want 2933MHz quad-rank modules running at 1.2V.
Skip if
- You are upgrading desktop computers, laptops, or standard consumer PCs.
- You already have ECC Registered (RDIMM) memory installed that you cannot replace.
- Your server hardware is built for 3200MHz DDR4 speeds.
Verdict: A-Tech 128GB DDR4 2933MHz ECC LRDIMM Kit delivers high-density capacity for server administrators whose system boards require quad-rank load-reduced memory.
A-Tech 128GB DDR4 LRDIMM
Best for: Dell PowerEdge servers needing 128GB capacity
- ECC Support
- ECC (what this guide is about)
- Total Capacity
- 128GB
- Memory Speed
- 2666MHz
- Voltage
- 1.2V
- Module Configuration
- 2x64GB
- Form Factor
- DIMM
This A-Tech kit provides 128GB of DDR4 ECC LRDIMM memory. It consists of two 64GB modules running at 2666MHz. The modules operate at 1.2V and use a 288-pin form factor. It is designed for Dell PowerEdge servers like the R440 and R640. This kit suits users needing high capacity with load-reduced technology for enterprise workloads.
Pros
- 128GB total capacity via two 64GB modules
- ECC LRDIMM technology for server stability
- 2666MHz speed with 1.2V voltage
- Compatible with Intel Xeon Scalable processors
Cons
- LRDIMM type requires specific server support
- 2666MHz speed is lower than 3200MHz options
- Limited to specific Dell PowerEdge models
Good fit if
- You need 128GB of RAM for a Dell PowerEdge server
- You require ECC LRDIMM technology for stability
- You use Intel Xeon Scalable processors
Skip if
- You need standard RDIMM modules instead of LRDIMM
- You are upgrading a non-Dell server
- You require speeds higher than 2666MHz
Verdict: A-Tech 128GB DDR4 LRDIMM Kit delivers high-capacity memory for Dell PowerEdge R440 and R640 servers. It is ideal for enterprise users needing 128GB of ECC LRDIMM storage with 2666MHz performance.
A-Tech 16GB DDR4 2400MHz ECC UDIMM
Best for: budget-conscious ECC unbuffered server repairs
- ECC Support
- ECC (what this guide is about)
- Total Capacity
- 16GB
- Memory Speed
- 2400MHz
- Module Configuration
- 1x16GB
- Compatible Device
- Server
- Form Factor
- UDIMM
This single-module RAM unit provides you with 16GB of DDR4 memory running at 2400MHz PC4-19200. It features an unbuffered 288-pin UDIMM layout with ECC support for compatible server motherboards. You will find it suits basic system repairs or capacity additions in machines configured strictly for unbuffered ECC memory rather than registered RDIMM or LRDIMM platforms.
Pros
- ECC unbuffered error-checking support
- 288-pin UDIMM server form factor
- Single 16GB module allows incremental memory additions
Cons
- 2400MHz speed is slower than 2666MHz and 3200MHz options
- 16GB capacity is lower than 32GB and 128GB alternatives
- Unbuffered design cannot mix with RDIMM or LRDIMM slots
Good fit if
- You need a single 16GB DDR4 ECC unbuffered DIMM for a server.
- You are replacing an existing Hynix HMA82GU7AFR8N-UH module.
- You operate hardware configured specifically for PC4-19200 speeds.
Skip if
- You require registered RDIMMs or load-reduced LRDIMMs.
- You want higher transfer rates such as 2666MHz or 3200MHz.
- You need higher density per slot, such as 32GB modules.
Verdict: A-Tech 16GB DDR4 2400MHz ECC UDIMM delivers standard-frequency unbuffered error-correcting memory for compatible servers requiring a single 16GB stick. It serves users maintaining systems that specifically mandate 2400MHz ECC UDIMMs instead of registered modules.
A-Tech 16GB DDR4 2666MHz ECC UDIMM
Best for: servers requiring 2666MHz unbuffered ECC UDIMM memory
- ECC Support
- ECC (what this guide is about)
- Total Capacity
- 16GB
- Memory Speed
- 2666 MHz
- Voltage
- 1.2V
- Module Configuration
- 1x16GB
- Form Factor
- UDIMM
This single 16GB A-Tech module provides DDR4 memory running at 2666MHz. It uses a 288-pin ECC unbuffered UDIMM form factor with a 2Rx8 dual-rank design at standard 1.2V power. If your server requires unbuffered ECC memory rather than registered DIMMs, you get error-checking capability for system stability at moderate transfer speeds.
Pros
- ECC unbuffered UDIMM architecture for error correction
- Standard 1.2V DDR4 operating voltage
- Dual-rank 2Rx8 layout with 2666MHz clock speed
Cons
- Lower 16GB capacity than 32GB or 128GB alternatives
- 2666MHz clock rate falls behind 3200MHz options
- UDIMM design is incompatible with RDIMM or LRDIMM sockets
Good fit if
- You need an ECC unbuffered 288-pin UDIMM module for your server.
- You want a dual-rank 16GB module running at 2666MHz and 1.2V.
- You are matching an existing PC4-21300 unbuffered memory configuration.
Skip if
- You require registered ECC RDIMMs or load-reduced LRDIMMs.
- You need faster DDR4 transfer speeds such as 3200MHz.
- You want higher memory density per slot than 16GB.
Verdict: A-Tech 16GB DDR4 2666MHz ECC UDIMM delivers standard-voltage unbuffered ECC memory for server owners needing a reliable single-stick replacement at PC4-21300 speeds.
A-Tech 32GB DDR4 3200MHz ECC RDIMM
Best for: Server builds needing single 3200MHz RDIMMs
- ECC Support
- ECC (what this guide is about)
- Total Capacity
- 32GB
- Memory Speed
- 3200 MHz
- Voltage
- 1.2V
- Module Configuration
- 1x32GB
- Form Factor
- RDIMM
This A-Tech server module gives you 32GB of capacity on a single 288-pin RDIMM. It runs at 3200MHz with DDR4 standard 1.2V operation. The stick features a dual-rank 2Rx4 build with registered ECC data protection. You will find this module useful if your server board requires 3200MHz registered memory for steady enterprise operation.
Pros
- 3200MHz operating frequency
- Registered ECC error correction
- Standard 1.2V DDR4 voltage
- Dual-rank 2Rx4 configuration
Cons
- Single-stick package offers no multi-channel kit bandwidth
- Registered RDIMM format does not work in standard desktop motherboards
Good fit if
- You need a single 32GB DDR4 3200MHz registered module for a server.
- You are replacing a compatible Samsung M393A4K40EB3-CWE memory module.
Skip if
- You run a standard consumer desktop that requires unbuffered RAM.
- You need a pre-matched multi-module kit for full memory channels.
Verdict: A-Tech 32GB DDR4 3200MHz ECC RDIMM provides server administrators with a high-speed registered module to expand system memory within standard 1.2V specifications.
A-Tech 32GB DDR4 3200MHz ECC RDIMM
Best for: 3200MHz DDR4 server memory expansion
- ECC Support
- ECC (what this guide is about)
- Total Capacity
- 32GB
- Memory Speed
- 3200 MHz
- Voltage
- 1.2V
- Module Configuration
- 1x32GB
- Form Factor
- RDIMM
This single 32GB memory module operates at 3200MHz and standard 1.2V. Built for server systems, the 288-pin RDIMM features dual-rank 2Rx4 architecture and ECC support to detect and correct data errors. It suits you if you need to upgrade an existing server setup or install a direct memory replacement that demands fast DDR4 transfer rates.
Pros
- Runs at 3200MHz speed (PC4-25600)
- ECC Registered (RDIMM) form factor for server stability
- Standard 1.2V DDR4 power requirement
- Dual-rank (2Rx4) configuration
Cons
- Ships as a single module rather than a multi-channel kit
- RDIMM design is restricted to server hardware, not desktop motherboards
Good fit if
- You need a single 32GB DDR4 module rated for 3200MHz server operation.
- You require 288-pin registered memory with a 2Rx4 dual-rank configuration.
Skip if
- You use standard desktop hardware requiring unbuffered non-ECC RAM.
- You need a multi-module memory kit out of the box.
Verdict: A-Tech 32GB DDR4 3200MHz ECC RDIMM provides reliable error correction and 3200MHz bandwidth for server administrators maintaining or expanding compatible DDR4 platforms.
A-Tech 32GB DDR4 3200MHz ECC RDIMM
Best for: single-module 3200MHz server memory replacements
- ECC Support
- ECC (what this guide is about)
- Total Capacity
- 32GB
- Memory Speed
- 3200 MHz
- Voltage
- 1.2V
- Module Configuration
- 1x32GB
- Form Factor
- RDIMM
A-Tech 32GB DDR4 3200MHz ECC RDIMM is a single-module server memory upgrade. It runs at 3200MHz at standard 1.2V and uses a 288-pin registered form factor with dual-rank 2Rx8 architecture. You get built-in ECC support to correct data errors during continuous server workloads. This module fits if you need to match existing server specifications or replace a Samsung M393A4G43AB3-CWE stick.
Pros
- DDR4 3200MHz operating speed (PC4-25600)
- 32GB density on a single 288-pin module
- ECC Registered (RDIMM) design for server error correction
- Standard DDR4 1.2V low operating voltage
Cons
- Single-module packaging provides no multi-channel bandwidth out of the box
- Registered RDIMM design is incompatible with standard desktop or unbuffered platforms
Good fit if
- You need a single 32GB DDR4 3200MHz RDIMM for a compatible server.
- You are replacing a Samsung M393A4G43AB3-CWE module.
Skip if
- You require unbuffered ECC memory or standard non-ECC desktop RAM.
- You want a matched multi-module kit for immediate multi-channel operation.
Verdict: A-Tech 32GB DDR4 3200MHz ECC RDIMM serves system administrators expanding compatible DDR4 servers or swapping out a matched Samsung module.
A-Tech 128GB (2x64GB) DDR4 2133MHz ECC LRDIMM
Best for: ASRock Rack ROMED8-2T high-capacity server upgrades
- ECC Support
- ECC (what this guide is about)
- Total Capacity
- 128 GB
- Memory Speed
- 2133 MHz
- Voltage
- 1.2V
- Module Configuration
- 2x64GB
- Form Factor
- DIMM
View on Amazon: A-Tech 128GB (2x64GB) DDR4 2133MHz ECC LRDIMM
This A-Tech memory kit delivers 128GB of total server memory across two 64GB 288-pin modules. It operates at 2133MHz with standard 1.2V DDR4 power requirements and uses a quad-rank 4Rx4 load-reduced design. Built specifically for compatible servers such as the ASRock Rack ROMED8-2T, this kit suits you if you need dense ECC memory capacity without filling every slot.
Pros
- High-capacity 128GB total memory via two 64GB modules
- ECC Load Reduced (LRDIMM) 4Rx4 architecture
- Standard 1.2V operating voltage
- Limited lifetime warranty support
Cons
- Base 2133MHz clock speed is lower than faster DDR4 alternatives
- Restricted to motherboards that support quad-rank ECC LRDIMMs
Good fit if
- You manage an ASRock Rack ROMED8-2T system needing a dense capacity upgrade.
- You require 1.2V quad-rank ECC Load Reduced memory modules.
Skip if
- You need higher memory frequencies like 2666MHz or 3200MHz.
- You use standard desktop or unbuffered server boards incompatible with LRDIMMs.
Verdict: A-Tech 128GB DDR4 2133MHz ECC LRDIMM Kit provides high-density quad-rank memory tailored for ASRock Rack ROMED8-2T server platforms. It fits enterprise operators who require substantial ECC capacity and stability at a standard 2133MHz frequency.
A-Tech 128GB DDR4 2400MHz LRDIMM
Best for: High-capacity Dell PowerEdge server upgrades
- ECC Support
- ECC (what this guide is about)
- Total Capacity
- 128 GB
- Memory Speed
- 2400 MHz
- Voltage
- 1.2V
- Module Configuration
- 4x32GB
- Form Factor
- DIMM
This A-Tech kit provides 128 GB of DDR4 ECC LRDIMM memory across four 32 GB modules. It runs at 2400 MHz with standard 1.2V voltage. The 2Rx4 configuration and 288-pin design suit specific Dell PowerEdge servers like the R640 and R740xd. You get high capacity for demanding server workloads. The kit includes all necessary modules for a full upgrade.
Pros
- Provides 128 GB total capacity via four 32 GB modules
- Uses ECC Load Reduced (LRDIMM) technology for stability
- Compatible with multiple Dell PowerEdge server models
- Standard 1.2V DDR4 voltage ensures efficiency
Cons
- Lower 2400 MHz speed compared to faster 2666 MHz or 3200 MHz options
- Requires four slots, limiting future expansion on some boards
- LRDIMM type is not compatible with standard UDIMM slots
Good fit if
- You need maximum memory capacity for a Dell PowerEdge server
- You are upgrading a system that specifically supports LRDIMM modules
- You require ECC error correction for critical data integrity
Skip if
- You are using a desktop PC that only accepts UDIMM memory
- You need higher speeds like 2933 MHz or 3200 MHz
- You want to install memory in a slot with only two available DIMM slots
Verdict: A-Tech 128GB DDR4 ECC LRDIMM Kit delivers substantial capacity for Dell PowerEdge R640 and R740xd servers. It is ideal for administrators needing large, stable memory pools for virtualization or database tasks.
A-Tech 128GB (2x64GB) DDR4 2400MHz ECC LRDIMM Kit
Best for: ASUS ESC server memory capacity expansions
- ECC Support
- ECC (what this guide is about)
- Total Capacity
- 128 GB
- Memory Speed
- 2400 MHz
- Voltage
- 1.2V
- Module Configuration
- 2x64GB
- Form Factor
- DIMM
View on Amazon: A-Tech 128GB (2x64GB) DDR4 2400MHz ECC LRDIMM Kit
This A-Tech memory kit delivers 128GB of server memory across two 64GB DDR4 modules running at 2400MHz. Operating at standard 1.2V, these 288-pin load-reduced DIMMs (LRDIMMs) use a 4Rx4 quad-rank configuration with ECC support to correct data errors. It suits you if you need to expand system memory on compatible ASUS ESC4000 or ESC8000 series rack servers.
Pros
- 128GB total capacity split across two 64GB modules
- Load-reduced ECC (LRDIMM) design with 4Rx4 quad-rank architecture
- Operates at standard DDR4 1.2V low operating voltage
- Backed by A-Tech limited lifetime warranty
Cons
- 2400MHz clock speed is slower than 2933MHz or 3200MHz DDR4 options
- Quad-rank LRDIMM modules cannot mix with standard RDIMMs or unbuffered memory
Good fit if
- You manage compatible ASUS ESC4000 or ESC8000 servers that support DDR4 LRDIMMs.
- You need a dense 128GB memory upgrade across two physical slots.
Skip if
- You require faster DDR4 transfer speeds such as 2933MHz or 3200MHz.
- You maintain server motherboards configured strictly for registered RDIMMs or unbuffered ECC RAM.
Verdict: A-Tech 128GB DDR4 2400MHz ECC LRDIMM Kit provides high-capacity quad-rank memory for administrators scaling up compatible ASUS ESC server nodes. It gives virtualization workloads substantial memory density at standard 1.2V operating levels.
Specifications side by side
| Spec | A-Tech 32GB DDR4 2400MHz ECC LRDIMM | A-Tech 16GB DDR4 2666MHz ECC RDIMM | A-Tech 32GB DDR4-2133 ECC RDIMM | A-Tech 32GB DDR4 2666MHz ECC RDIMM | A-Tech 32GB DDR4 2400MHz ECC RDIMM | A-Tech 128GB (2x64GB) DDR4 2933MHz ECC LRDIMM | A-Tech 128GB DDR4 LRDIMM | A-Tech 16GB DDR4 2400MHz ECC UDIMM | A-Tech 16GB DDR4 2666MHz ECC UDIMM | A-Tech 32GB DDR4 3200MHz ECC RDIMM | A-Tech 32GB DDR4 3200MHz ECC RDIMM | A-Tech 32GB DDR4 3200MHz ECC RDIMM | A-Tech 128GB (2x64GB) DDR4 2133MHz ECC LRDIMM | A-Tech 128GB DDR4 2400MHz LRDIMM | A-Tech 128GB (2x64GB) DDR4 2400MHz ECC LRDIMM Kit |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total Capacity | 32GB | 16GB | 32GB | 32GB | 32GB | 128GB | 128GB | 16GB | 16GB | 32GB | 32GB | 32GB | 128 GB | 128 GB | 128 GB |
| Memory Speed | 2400MHz | 2666 MHz | 2133 MHz | 2666 MHz | 2400MHz | 2933MHz | 2666MHz | 2400MHz | 2666 MHz | 3200 MHz | 3200 MHz | 3200 MHz | 2133 MHz | 2400 MHz | 2400 MHz |
| Voltage | 1.2v | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | not specified | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V | 1.2V |
| Module Configuration | 1x32GB | 1x16GB | 1x32GB | 1x32GB | 1x32GB | 2x64GB | 2x64GB | 1x16GB | 1x16GB | 1x32GB | 1x32GB | 1x32GB | 2x64GB | 4x32GB | 2x64GB |
| Form Factor | LRDIMM | RDIMM | RDIMM | RDIMM | RDIMM | LRDIMM | DIMM | not specified | UDIMM | RDIMM | RDIMM | RDIMM | DIMM | DIMM | DIMM |
| ECC Support | ECC Load Reduced | ECC | ECC | ECC | ECC Registered | ECC Load Reduced | ECC LRDIMM | ECC Unbuffered | ECC Unbuffered | ECC Registered | ECC Registered | ECC Registered | ECC Load Reduced | ECC Load Reduced | ECC Load Reduced |
| Compatible Device | Server | not specified | not specified | not specified | Server | Server | Server | Server | Server | Server | Server | Server | Server | Server | Server |
| Size | 32GB 2400MHz (PC4-19200) 2Rx4 | 16GB | 32GB | 32GB | 32GB | 2Rx4 | 64GB | 4DRx4 | 64GB 2666MHz (PC4-21300) LRDIMM | 16GB | 16GB | 32GB | 32GB | 32GB | 128 GB | 128 GB | 128 GB |
| Dimensions | not specified | 5.25 × 1.23 × 0.15 inches | 5.25 × 1.23 × 0.15 inches | 5.25 × 1.23 × 0.15 inches | 5.25 × 1.23 × 0.15 inches | 5.25 × 1.23 × 0.15 inches | not specified | not specified | 5.25 × 1.18 × 0.15 inches | 5.25 × 1.18 × 0.15 inches | 5.25 × 1.18 × 0.15 inches | 5.25 × 1.18 × 0.15 inches | 5.25 × 1.18 × 0.15 inches | 5.25 × 1.18 × 0.15 inches | 5.25 × 1.18 × 0.15 inches |
| Color | Server Module (1 x ECC LRDIMM) | not specified | not specified | not specified | 1 Module | 2 Module Kit | (64GB x 2 Modules) | 128GB Kit | not specified | not specified | not specified | not specified | not specified | Multicolor | Multicolor | Multicolor |
| Model | AT316640SRV-X1L1 | HMA82GR7CJR8N-VK-ATC | M393A4K40BB0-CPB-ATC | M393A4K40BB2-CTD-ATC | AT32G1D4D2400RD4N12V | AT64G2D4D2933LQ4N12V | not specified | HMA82GU7AFR8N-UH-ATC | ARS469 | ARS952 | ARS951 | ARS947 | ARW620 | ASQ179 | ASQ892 |
You can review the best DDR4 motherboards to confirm memory speed limits and ECC compatibility for your build.
How to choose the right one
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Match Form Factor Precisely
You must verify the physical module type before purchasing. RDIMMs are registered modules suitable for standard server slots. LRDIMMs provide load-reduced memory for high-capacity needs. UDIMMs are unbuffered options for specific systems. The A-Tech 32GB DDR4 2400MHz ECC LRDIMM fits Dell PowerEdge R630 units requiring load-reduced expansion. Using the wrong form factor prevents the server from booting. Always check your motherboard manual to confirm which slot type is supported for your specific hardware configuration.
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Verify Memory Speed
Check the frequency listed on the module. Common speeds include 2133MHz, 2400MHz, 2666MHz, and 3200MHz. Your server must support the specific speed of the RAM you buy. The A-Tech 32GB DDR4 3200MHz ECC RDIMM offers high bandwidth for compatible platforms. Lower speeds like 2133MHz work for older builds. Mismatched speeds can cause instability or force the system to run slower. Ensure the module frequency matches your server’s maximum supported memory speed for optimal performance.
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Confirm ECC Support
Error Correction Code memory is essential for server stability. All modules in this guide support ECC to detect and fix data errors. This feature protects against data corruption during heavy workloads. You need ECC if your server requires it for critical tasks. The A-Tech 16GB DDR4 2666MHz ECC RDIMM delivers registered error-correcting memory for standard builds. Without ECC, you risk silent data corruption. Verify that your server motherboard explicitly supports ECC memory before selecting any module from this list.
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Check Voltage Requirements
Standard DDR4 voltage is 1.2V. Most modules in this list operate at this standard voltage. The A-Tech 16GB DDR4 2666MHz ECC RDIMM and the 32GB 2666MHz variant both use 1.2V. Operating at the correct voltage ensures stability and prevents overheating. Using incorrect voltage can damage the memory or the motherboard. Always verify the voltage specification in your server’s documentation. Stick to 1.2V modules unless your specific hardware requires a different voltage profile for compatibility.
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Assess Capacity Needs
Determine the total memory required for your workload. Options range from 16GB to 128GB kits. The A-Tech 128GB DDR4 2933MHz ECC LRDIMM Kit provides high-density capacity for enterprise servers. Smaller 16GB or 32GB modules suit basic upgrades. Consider how much memory your applications actually consume. Over-provisioning wastes resources, while under-provisioning causes bottlenecks. Check your current usage and plan for future growth. Select a module or kit that meets your immediate needs while allowing for manageable expansion later.
Frequently asked questions
What is the difference between RDIMM and LRDIMM?
RDIMM stands for Registered DIMM and uses a buffer to manage data signals, making it suitable for standard server slots. LRDIMM, or Load-Reduced DIMM, adds an extra buffer to reduce electrical load, allowing for higher memory capacities. You should choose LRDIMM if your server requires high-density expansion, while RDIMM works for standard registered memory needs.
Does ECC memory prevent data corruption?
Yes, Error Correction Code memory detects and fixes single-bit data errors automatically. This feature ensures data integrity in server environments where reliability is critical. All modules in this list support ECC, providing a layer of protection against silent data corruption during processing and storage tasks.
Can I mix RDIMM and LRDIMM in the same server?
No, you cannot mix RDIMM and LRDIMM modules in the same server. They have different buffering architectures and electrical requirements. You must use identical form factors across all slots to ensure system stability and proper operation. Check your server manual to confirm the required module type.
What voltage do these DDR4 server modules use?
Most of the listed DDR4 server modules operate at 1.2V. This standard voltage helps reduce power consumption and heat generation compared to older memory types. Specific models like the 16GB DDR4 2666MHz ECC RDIMM explicitly list 1.2V, ensuring compatibility with standard server power specifications.
Which memory is best for Dell PowerEdge R640?
The A-Tech 128GB DDR4 2400MHz ECC LRDIMM Kit is ideal for Dell PowerEdge R640 servers. It provides substantial capacity for virtualization or database tasks. This kit delivers high-density quad-rank memory, ensuring stable performance for enterprise users needing large memory pools in compatible Dell hardware.
Is UDIMM suitable for all servers?
No, UDIMM is only suitable for servers that specifically require unbuffered memory. It lacks the register found in RDIMMs, making it incompatible with standard registered server slots. Use UDIMM only if your server manual explicitly mandates unbuffered ECC modules, such as for certain budget-conscious repairs.
What does 2Rx4 mean on a RAM module?
2Rx4 indicates the memory rank and width configuration. It means the module has two ranks and each chip provides 4 bits of data width. This specification affects how the memory interacts with the server controller. You should match this rank configuration when replacing specific modules like the 32GB 2400MHz ECC LRDIMM.
Can I use 2666MHz RAM in a 2400MHz server?
You can use faster RAM, but it will run at the speed supported by your server. If your server is calibrated for 2400MHz, a 2666MHz module will downclock to 2400MHz. Always check your server’s supported speeds to ensure optimal performance and compatibility with the installed memory modules.