Samsung M321R4GA3BB0-CQK

Technical Overview

Samsung M321R4GA3BB0-CQK is a 32GB DDR5-4800 RDIMM with a 2Rx8 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 32GB DDR5-4800 RDIMM 2Rx8. 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
• 4GA3 — 32GB module density (x8 dual-rank)
• BB0 — die and package revision
• CQK — DDR5-4800 speed grade

Use the full code on the quote. Nearby 4GA0 parts are typically 1Rx4. Those are different products.

Key Specifications

Part Number: M321R4GA3BB0-CQK
Manufacturer: Samsung
Capacity: 32GB (1x 32GB)
Memory Type: DDR5 SDRAM
Module Type: RDIMM (Registered DIMM)
Speed: 4800 MT/s
Module Name: PC5-38400R
Rank / Organization: 2Rx8
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 32GB 2Rx8 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 32GB DDR5 RDIMM already in the server
• Entry and mid-capacity upgrades that specify 32GB DDR5-4800 RDIMM, 2Rx8
• 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:

• 32GB
• DDR5-4800 / PC5-38400R
• RDIMM
• 2Rx8
• ECC
• 1.1V / 288-pin

Do not treat a 32GB 1Rx4 module (for example 4GA0), a DDR5-5600/6400 4GA3 part, or an LRDIMM as a drop-in for this CQK 2Rx8 stick.

What to Send for a Quote

1. Part number: M321R4GA3BB0-CQK
2. Quantity
3. Optional: server brand and model
4. Optional: photo of the module label
5. Or: 32GB + DDR5-4800 + RDIMM + 2Rx8

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 M321R4GA0BB0-CQK?
Same 32GB / DDR5-4800 class, but that part is 1Rx4. This part is 2Rx8. Quote the exact number on your label.

Is this the same as M321R4GA3EB0-CWM or M321R4GA3PB0-CWM?
Same 32GB 2Rx8 class, but those nearby codes use different speed grades. This part is DDR5-4800. Quote the exact number on your label.

Will any DDR5 server take 32GB 2Rx8 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.