Samsung 64GB DDR5-5600 ECC Registered RDIMM 2Rx4 (M321R8GA0PB0-CWM)

Reasons to choose this module

• Registered DIMM: a register buffers clock, command and control signals for larger memory populations.
• Error correction via 8 additional ECC bits per subchannel.
• High per-module capacity (64GB) for virtualisation, data preparation and AI host workloads.
• Samsung-manufactured DRAM and module, 1.1V DDR5 operation.

Platform compatibility checklist

• Confirm the CPU and motherboard support registered DDR5 (RDIMM). Desktop UDIMM-only boards will not run it.
• Do not mix RDIMMs with UDIMMs, or with 3DS/LRDIMM/MRDIMM modules, in one system.
• Check the server vendor qualified memory list for this exact part number and the required BIOS level.
• Follow the DIMMs-per-channel population rules; speed may drop below 5600 MT/s with two DIMMs per channel.
• Match capacity, rank and speed across all modules in a channel set for balanced memory population.

Technical specifications

In the box

1 × Samsung 64GB DDR5-5600 ECC RDIMM, M321R8GA0PB0-CWM.

Single memory module, typically supplied in bulk/ESD packaging. No heat spreader, CPU, motherboard or system is included.

Dispatch, packaging and warranty

Dispatch within 24–48 hours (business days). Stock shown on the page is not a reservation, and transit time to your address is separate from dispatch.

Estimated protective shipping parcel: 25 × 15 × 6 cm, 0.3 kg total. These are packing estimates, not product dimensions; final packed size and weight may vary.

Manufacturer warranty under Samsung terms for server memory modules. Proof of purchase and manufacturer terms apply; contact us to start a claim. Statutory consumer rights remain unaffected.

Frequently asked questions

Will this RDIMM work in a normal DDR5 desktop motherboard?

No. Consumer DDR5 boards take unbuffered UDIMMs only. This module needs a platform that explicitly supports registered DDR5 RDIMMs.

Is this one module or a kit?

You receive one 64GB module. Order the number of modules your channel population requires; it is not a matched multi-module kit.

Will it always run at 5600 MT/s?

It is rated DDR5-5600. The CPU, BIOS and DIMMs-per-channel population decide the actual speed, which may be lower with 2DPC.

Can I mix it with my existing server memory?

Mixing different capacities, ranks or vendors may lower speed or fail validation. Use identical modules per channel and follow the server manual.

Does DDR5 on-die ECC make any module equivalent to this one?

No. This RDIMM has full side-band ECC plus a register. On-die ECC in desktop DDR5 is a different, internal feature.

Can this RAM add to the VRAM of my graphics card?

No. System memory and GPU memory are separate resources. Plan host memory and GPU VRAM independently around the models and software you intend to run.

Manufacturer reference

Samsung Semiconductor DDR5 RDIMM product family