Samsung M321R2GA3BB6-CQK

Technical Overview

Samsung M321R2GA3BB6-CQK is a 16GB DDR5-4800 RDIMM with a 1Rx8 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 16GB DDR5-4800 RDIMM 1Rx8. 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
• 2GA3 — 16GB module density (x8 single-rank)
• BB6 — die and package revision
• CQK — DDR5-4800 speed grade

Use the full code on the quote. Nearby BB0 codes share the same density class but use a different die revision. Nearby 4GA3 parts are 32GB 2Rx8.

Key Specifications

Part Number: M321R2GA3BB6-CQK
Manufacturer: Samsung
Capacity: 16GB (1x 16GB)
Memory Type: DDR5 SDRAM
Module Type: RDIMM (Registered DIMM)
Speed: 4800 MT/s
Module Name: PC5-38400R
Rank / Organization: 1Rx8
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 16GB 1Rx8 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 16GB DDR5 RDIMM already in the server
• Entry-capacity upgrades that specify 16GB DDR5-4800 RDIMM, 1Rx8
• 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:

• 16GB
• DDR5-4800 / PC5-38400R
• RDIMM
• 1Rx8
• ECC
• 1.1V / 288-pin

Do not treat a 32GB 2Rx8 module (for example 4GA3), a DDR5-5600/6400 2GA3 part, or an LRDIMM as a drop-in for this CQK 1Rx8 stick. If the label shows BB0 instead of BB6, send that exact code.

What to Send for a Quote

1. Part number: M321R2GA3BB6-CQK
2. Quantity
3. Optional: server brand and model
4. Optional: photo of the module label
5. Or: 16GB + DDR5-4800 + RDIMM + 1Rx8

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 M321R2GA3BB0-CQK?
Same 16GB / DDR5-4800 / 1Rx8 class, but BB6 and BB0 are different die revisions. Quote the exact number on your label.

Is this the same as M321R4GA3BB6-CQK?
No. That nearby code is 32GB 2Rx8. This part is 16GB 1Rx8.

Will any DDR5 server take 16GB 1Rx8 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.