Samsung 128GB DDR5 6400MHz RDIMM ECC Registered

Trusted High-Performance Server Memory from the UK's Leading Upgrade Specialist

For guaranteed compatibility, please choose your Model, use our ScanMyPC app, or Contact a Memory Specialist for assistance.

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Benefits of Upgrading Free Delivery Available

Product:Memory / RAM

Size:

Kit:Single Module

Type:DDR5 DIMM

Class:Server / Enterprise

Speed:PC5-51200 6400MHz

ECC:ECC Registered

Pins:288-pin

Part No:M321RAJA0MB2-CCPPC

Stock:

The Samsung DDR5 6400MHz ECC RDIMM delivers exceptional speed, reliability and efficiency for high-performance servers and data centres. ECC provides automatic error correction, while registered buffering improves signal integrity to maintain stability under heavy workloads. Operating at 6400 MT/s, the module enables faster data transfer and greater bandwidth for demanding applications such as virtualisation, AI and analytics, and advanced DDR5 architecture cuts power consumption. Ideal for next-generation enterprise systems requiring dependable, high-speed memory.

Orders placed Monday to Friday after 4.30pm (UK time) or on weekends/bank holidays will be processed the next business day.
(subject to stock, order verification and chosen delivery option)

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32 YEARS
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Trusted & Reliable Customer Reviews

Placed order online easy enough and…

Placed order online easy enough and delivered on time what's not to like, and it works. Thanks

TONY P - Tuesday 9th June 2026

Verified order

Good service

Great after care when we had an issue

Chris - Friday 22nd May 2026

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Mr Memory was very helpful all the time

M. Bran - Tuesday 19th May 2026

Verified order

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Items arrive quickly and well packaged

Items arrive quickly and well packaged. Bought from Mr Memory 4 or 5 times over past few years. Always great customer support.

Sharon E - Monday 4th May 2026

Verified order

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4.9 out of 5 MORE REVIEWS

Benefits of Upgrading your Computer Memory

Upgrading is Easy - Go to the Maximum - Renew your Device

If you can change the batteries in your remote control, you can upgrade your memory too! It really is that simple!

The files and programmes on your device are stored on the Hard Drive or Solid State Drive, not the RAM - so you will not lose anything when replacing modules.

Speed & Peak Performance

Improve start-up time and optimise the speed of your operating system
Maximise all-round efficiency & multitask with ease
Speed up your games and apps, including video and photo editing software
Peak performance for home schooling, streamers, video callers, gamers & online shoppers
Improve the performance of your favourite video streaming platforms

Simple, Quick & Easy

Easy as 1, 2, 3 (Order, Deliver, Install)
Upgrading your computers memory is simple with our easy to follow installation guides & videos
Free support provided by our friendly specialists should you need help
Easy to install - Upgrade your computer in less than 5 minutes
Working from home? Ensure your computer is up to the task with a simple Memory upgrade

Big Savings

Don't waste money on a new machine when you can renew & extend what you have!
Save money on unnecessary installation costs by upgrading yourself
Increasing your computers memory will give you the biggest performance increase for your money
Save hours of lost time waiting for your computer to load
Maximise the value of your computer

Reduce your impact on the Environment

Join 500,000+ Mr Memory customers who saved their computer from a trip to the recycling centre
Renewing your device instead of replacing it reduces e-waste and greenhouse emissions
Help electronics become a more sustainable part of our lives by renewing them
By using your electronic devices for as long as possible, you are saving the planet’s resources
Return your old Memory to us and we will ensure it is responsibly recycled

Working from Home & Hybrid Working

If you work from home or are thinking of doing so in the future you need to have the right tools available to do your job as efficiently as possible. Whether you use your own computer or a company owned device, do not be slowed down by insufficient memory or storage. Upgrading the memory and/or SSD is a simple way to save time when working from home.

Increase home working efficiency and performance
Create a stress free and healthier environment with less distractions
Minimise the impact of a slow connection, and improve the responsiveness of video calls
Easily upgrade your computer at home, and claim on company expenses
Working from home has been shown to improve creativity and give a better home life/work balance
Save time and money on commuting, and benefit from flexible scheduling

Trust the Mr Memory Brand

Feel Safe, Feel Secure & Feel Appreciated

We help people to feel safe, happy and secure. You can trust the Mr Memory brand - we will protect your data, save you money and improve the performance of your valued devices, whilst being eco-responsible.

Our specialists provide free support to anyone who needs it - at any stage of the order process. Our communication is fast and our guidance is as technical or as basic as you need it to be.

Buy from a UK based company with 32 years experience
100% Safe & Secure website
Fully informed at every stage of the order
Fast dispatch - 98% of orders dispatched same day
Highest quality brand new products from the best brands in the world
RAM extensively tested prior to shipment
Accurate database with new models added daily
30-day credit available to the Public / Private Sector
250,000+ businesses use Mr Memory for their Memory/RAM & SSD upgrades
Over 150,000 registered online customers
We are compliant with the latest privacy regulations including the UK and EU GDPR

Working Towards a Sustainable Future

Mr Memory is tackling climate change as a team with an aim to being carbon neutral by 2027.

Our employees are encouraged to walk, cycle or car share
We encourage our employees to stay healthy, eat more sustainable food and buy locally
We always try to purchase from UK based companies where possible
We hold regular staff meetings where our employees opinions on climate change are heard
We supply appropriate uniform to reduce heating and air-con use
We have waste reduction procedures in place - all of our packaging can be recycled
Our refuse bags are bio-degradable
Our cleaning equipment and products are all eco-friendly
Our printing is limited to essential customer paperwork only
When not in use all electrical devices are turned off and we always purchase energy efficient devices
Our energy supplier is moving to 100% renewable electricity and is a COP29 Principal Partner
All of our suppliers use recyclable packaging, which we reuse where possible
We are constantly reviewing our Sustainability Statement

Play our educational HD videos

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Module:	x1 (single module only)
Brand:	Samsung
Compatibility:	Commonly installed in Servers. For guaranteed compatibility, please choose your Model
System Warranty:	This upgrade will not invalidate your system warranty
Speed:	6400MT/s (PC5-51200)
Technology:	DDR5 SDRAM
Pins:	288-pin, Gold Connectors
Form Factor:	RDIMM (Registered Dual Inline Memory Module)
Module Dimensions:	133.5mm x 31mm (LxH)
Data Integrity:	ECC Registered
Ranking:	1R, 2R, 4R
Voltage:	1.1V
Warranty:	Limited 3 Year Manufacturers Warranty

Samsung 128GB DDR5 6400MHz RDIMM ECC Registered

Trusted High-Performance Server Memory from the UK's Leading Upgrade Specialist

Product Specifications

Installation & Support

Installation is Easy with Fast & Professional Support

Installation

Support

Delivery, Returns & Refunds

Fast Delivery

Fast Returns & Refunds

Trusted & Reliable Customer Reviews

Placed order online easy enough and…

Good service

Mr Memory was very helpful all the time

Items arrive quickly and well packaged

ServerCare Memory Solutions

Mr Memory cares about your IT Infrastructure

ServerCare Programme

Trust Mr Memory to provide you with:

Benefits of Upgrading your Computer Memory

Upgrading is Easy - Go to the Maximum - Renew your Device

Speed & Peak Performance

Simple, Quick & Easy

Big Savings

Reduce your impact on the Environment

Working from Home & Hybrid Working

Trust the Mr Memory Brand

Feel Safe, Feel Secure & Feel Appreciated

Working Towards a Sustainable Future

We are eco‑responsible

Play our educational HD videos