Samsung M321R8GA0BB0-CQK
- Part Number: M321R8GA0BB0-CQK
- Manufacturer: Samsung
- Capacity: 64GB
- Memory Type: DDR5
- Module Type: RDIMM
- Speed: 4800 MT/s
- Module Name: PC5-38400R
- Rank / Org: 2Rx4
- ECC: Yes
- Voltage: 1.1V
- Pins: 288-pin
This Samsung module is a 64GB DDR5-4800 registered DIMM (RDIMM), 2Rx4, with ECC. Samsung makes both the DRAM and the finished module.
Use this page when the label shows this part number, or when you need 64GB DDR5-4800 RDIMM 2Rx4 for a server build or replacement.
Related Products For Your Business
Technical Overview
Samsung M321R8GA0BB0-CQK is a 64GB DDR5-4800 RDIMM with a 2Rx4 organization and ECC. The module name is PC5-38400R. Samsung builds both the DRAM and the finished server module.
Most requests start from the number on the label, or from a build that needs 64GB DDR5-4800 RDIMM 2Rx4. Send the exact part number when you have it. If you only know the specification, send capacity, speed, module type and rank.
How to Read This Part Number
- M321R — Samsung DDR5 RDIMM family
- 8GA0 — 64GB module density
- BB0 — die and package revision
- CQK — DDR5-4800 speed grade
Use the full code on the quote. Do not treat a 64GB 2Rx8, 1Rx4, or a different speed grade as the same product.
Key Specifications
Part Number: M321R8GA0BB0-CQK
Manufacturer: Samsung
Capacity: 64GB (1x 64GB)
Memory Type: DDR5 SDRAM
Module Type: RDIMM (Registered DIMM)
Speed: 4800 MT/s
Module Name: PC5-38400R
Rank / Organization: 2Rx4
Error Correction: ECC
Voltage: 1.1V
Pin Count: 288-pin
Form Factor: Standard-height DIMM
Before adding memory to a populated server, match these values against the modules already installed: capacity, DDR generation, RDIMM or LRDIMM, rank, organization, speed and voltage. Also confirm the server CPU and motherboard list 64GB 2Rx4 RDIMM as supported.
RDIMM vs LRDIMM
This module is an RDIMM. Mixing RDIMM and LRDIMM in the same population is usually not allowed. If the installed memory is LRDIMM, quote an LRDIMM equivalent, or send a photo of the current label.
Where This Module Is Used
- Replacing the same Samsung 64GB DDR5 RDIMM already in the server
- Capacity upgrades that specify 64GB DDR5-4800 RDIMM, 2Rx4
- Balanced server builds and spare stock that call out this exact code
The same Samsung module may also appear under an HPE, Dell, Cisco, Supermicro or Lenovo label. If you need the OEM-labeled stick, include that number on the quote as well.
Matching Related Modules
A different speed, rank, density, or RDIMM vs LRDIMM code is a different product. Before approving a substitute, match:
- 64GB
- DDR5-4800 / PC5-38400R
- RDIMM
- 2Rx4
- ECC
- 1.1V / 288-pin
Do not treat a 64GB 2Rx8 module, a DDR5-5600/6400 8GA0 part, or an LRDIMM as a drop-in for this CQK 2Rx4 stick.
What to Send for a Quote
- Part number: M321R8GA0BB0-CQK
- Quantity
- Optional: server brand and model
- Optional: photo of the module label
- Or: 64GB + DDR5-4800 + RDIMM + 2Rx4
Mixed lists are fine, including other DDR4/DDR5 lines and OEM-labeled pulled memory.
FAQ
Is this an LRDIMM?
No. It is a Samsung DDR5 RDIMM. Confirm the installed type before ordering.
Is this the same as M321R8GA0EB0-CWM or M321R8GA0EB2-CCP?
Same 64GB class, but those nearby codes use different speed grades and may differ in die revision. This part is DDR5-4800 2Rx4. Quote the exact number on your label.
Will any DDR5 server take 64GB 2Rx4 modules?
Most DDR5 RDIMM platforms do, but always confirm the QVL or memory guide for your CPU and motherboard.
Can I order only a few pieces?
Yes. Orders can start at two modules.
Do you quote OEM-labeled versions too?
Yes. Include the HPE, Dell, Cisco, Supermicro or Lenovo number if the server needs that label.