M321R4GA3BB0-CQK: Samsung 32GB DDR5-4800MHz PC5-38400 ECC Registered CL40 1Rx4 RDIMM Server Memory
Also listed as: M321R4GA3BB0-CQKEG, M321R4GA3BB0-CQK00, M321R4GA3BB0 · made by Samsung
The Samsung M321R4GA3BB0-CQK is a 32GB DDR5-4800 single-rank 1Rx4 registered ECC memory module (RDIMM) engineered for enterprise server platforms based on 4th Gen Intel Xeon Scalable and AMD EPYC 9004 processors. Operating at 1.1V with standard CL40 timings, it incorporates dual independent 32-bit subchannels, on-die ECC, and an integrated Power Management IC (PMIC). When purchasing used server memory, examine the 288-pin edge connector for scratch marks, ensure the SPD EEPROM is intact, and avoid mixing with 2Rx4 or higher-speed DIMMs in the same memory channel.
Specifications
| Part number | M321R4GA3BB0-CQK |
|---|---|
| Brand | Samsung |
| Made by | Samsung |
| Type | Memory |
| Other numbers | M321R4GA3BB0-CQKEG, M321R4GA3BB0-CQK00, M321R4GA3BB0 |
| Status | current |
| Capacity (GB) | 32 |
| Speed | DDR5-4800 |
| Rank width | 1Rx4 |
| Generation fit | Intel 4th Gen Xeon Scalable and AMD EPYC 9004 series servers |
About the M321R4GA3BB0-CQK
M321R4GA3BB0-CQK is Samsung's mainstream 32GB single-rank (1Rx4) DDR5-4800 registered ECC memory module for enterprise data centers. Fabricated using Samsung's advanced 14nm EUV DRAM process, it operates at 1.1V standard operating voltage and provides 38.4 GB/s peak bandwidth per module. It serves as the baseline memory module for servers powered by 4th Gen Intel Xeon Scalable (Sapphire Rapids) and AMD EPYC 9004 (Genoa) processors, succeeding DDR4-3200 RDIMMs.
Compatibility
The module is engineered for servers supporting DDR5 registered DIMMs, including Dell PowerEdge 16G (R760, R660), HPE ProLiant Gen11 (DL380, DL360), Lenovo ThinkSystem V3 (SR650 V3, SR630 V3), and Supermicro H13/X13 systems. It does not fit DDR4 server motherboards or desktop motherboards. It should not be mixed with 2Rx4 or 4Rx4 modules on the same memory channel to maintain maximum operational speed and stability.
How to identify a genuine unit
Genuine modules feature a blue or green PCB with laser-etched Samsung DRAM chips and a barcode sticker reading M321R4GA3BB0-CQK, 32GB 1Rx4 PC5-4800B-RC0, with country of manufacture (Korea, Philippines, or China). The module features an onboard Power Management IC (PMIC) in the center of the PCB. Motherboard IPMI/BMC inventory tools report Samsung vendor ID and standard JEDEC SPD timings.
Buying used
Request diagnostic verification (such as MemTest86+ or OEM hardware diagnostics) showing zero ECC error corrections. Inspect the 288-pin gold edge connector for gouges or peeled contact traces caused by forced insertion. Ensure the onboard PMIC chip and tiny surface-mount inductors are intact and free of thermal discoloration.
Reference prices (last 14 days, updated 2026-10-27)
New: USD 120 (1 sighting, Oct 2026)
Used: USD 75 (1 sighting, Oct 2026)
All sightings
| Seller | Condition | Price | Note | Seen |
|---|---|---|---|---|
| serversupply.com | new | USD 120 | 2026-10-27 | |
| ebay.com | used | USD 75 | 2026-10-27 |
Prices seen on public listings on the dates shown, before tax and shipping. Not an offer.
Fits these models
Equivalent part numbers
- Lenovo 4X77A77495 ThinkSystem 32GB TruDDR5 4800MHz (1Rx4 1.1V) RDIMM ThinkSystem 32GB TruDDR5 4800MHz 1Rx4 RDIMM
- Dell AB949334 Dell 32GB DDR5 4800MHz 1Rx4 RDIMM
FAQ
What voltage does this DDR5 RDIMM operate at?
Standard DDR5 JEDEC voltage of 1.1 Volts.
Is this memory compatible with desktop motherboards?
No, it is a Registered ECC RDIMM requiring a server motherboard and CPU.
What is the module rank structure?
It is single-rank by 4 (1Rx4) utilizing 16Gb density DRAM chips.
Buying or selling M321R4GA3BB0-CQK?
New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.
Sources
- Samsung Semiconductor DDR5 RDIMM Product Catalog, checked 2026-10-27