Samsung · DDR5 RDIMM 32GB
M321R4GA0BB0-CQK is Samsung DDR5 RDIMM 32GB DDR5. 2 of its 4 segments are defined in Samsung's published documentation and decoded below; for the rest we have not found a defining document, and they are marked as such. No live listings right now - the reference material below still applies.
| Segment | What it means | Source |
|---|---|---|
| M | Samsung memory module prefix. | Samsung |
| 321 | DDR5 Registered DIMM (RDIMM). | Samsung |
| R4GA0BB0 | Not sourced - we have not found a Samsung document defining this segment. | Not sourced |
| CQK | Not sourced - we have not found a Samsung document defining this segment. | Not sourced |
We decode only what the manufacturer documents. There is a large body of community knowledge about the undocumented segments above, much of it probably right, and none of it published by Samsung - so it does not appear in this table. A reading nobody can check does not belong in a column headed “what it means”. Grammar reference: Samsung - DDR4/DDR5 module part-number decoder.
M321R4GA0BB0-CQK is Samsung DDR5 RDIMM 32GB, a server memory module on DDR5. Registered ECC modules are not interchangeable with unbuffered desktop memory, and a server board will generally refuse to post with the wrong type rather than run slowly.
We hold no live listing against this exact part number at the moment. We document no sibling variants for this part number.
| Manufacturer | Samsung |
| Family | DDR5 RDIMM 32GB |
| Interface | DDR5 |
| Product class | RAM |
No seller we track has M321R4GA0BB0-CQK in stock right now. That describes today's listings only - it says nothing about whether the model is discontinued. We are not going to fill this space with something else and call it a match. The decode, specifications and sibling table above are the reference answer for this part number and remain accurate whether or not anyone is selling one today. If you need the capacity rather than this specific part, the alternatives below are what is actually buyable.
A manufacturer part number does not imply a manufacturer warranty, and this is where part-number buyers lose the most money. OEM stock, integrator pulls and gray-market units all reach the market under the maker's own numbering. Retailers selling them sometimes state plainly that the manufacturer warranty is none; others simply do not mention it, which is not the same as it being covered.
Coverage attaches to the individual unit and its serial number, not to the part number. That means the only reliable answer comes from the manufacturer, about the specific drive you are being sold.
Ask the seller for the serial number before purchase, then enter it in Samsung memory support. We link the tool rather than showing a result here, because the answer depends on the individual drive and only Samsung can give it.
A seller warranty is a different promise from a different company. What each warranty tier actually covers · Verify on arrival
4 in-stock listings · nothing at this capacity is in stock, so these are the nearest capacities · ranked by live cost per gb, refreshed about once a day
| Drive | Capacity | Condition | $/GB | Price | |
|---|---|---|---|---|---|
| A-Tech 16GB DDR4-2133 ECC RDIMM M393A2G40DB0-CPB | 16GB | NEW This offer: sold by A-Tech Components · Amazon says New / Unknown | $5.44 | $87 | Buy/View Price |
| Samsung 16GB DDR4-2133 ECC RDIMM M393A2G40EB1-CPB | 16GB | NEW This offer: sold by A-Tech Components · Amazon says New / Unknown | $7.12 | $114 | Buy/View Price |
| Samsung 16GB DDR4-2666 ECC RDIMM M393A2K43CB2-CTD8Q | 16GB | REFURB This offer: sold by MemoryMasters · Amazon says Used / VeryGood | $8.75 | $140 | Buy/View Price |
| Crucial 16GB DDR4-2400 ECC RDIMM B017UGKB32 | 16GB | NEW This offer: sold by Memorybank · Amazon says New / Unknown | $11.25 | $180 | Buy/View Price |
M321R4GA0BB0-CQK is Samsung DDR5 RDIMM 32GB DDR5. 2 of its 4 segments are defined in Samsung's own published documentation - the decode table on this page shows each one with the document that defines it. For the remaining segments we have not found a defining document, and we say so rather than repeating a community guess as fact.
Not necessarily, and the part number cannot tell you. Coverage depends on how the individual unit entered the market and whether it was registered, not on its model designation. OEM and gray-market stock reaches the market under manufacturer part numbers regularly and frequently carries no manufacturer warranty at all - some retailers print exactly that on the listing. Check the specific serial with Samsung's own tool, linked in the warranty section on this page.
We hold no live listing for this part number right now. That is the honest state rather than a broken page - this remains the reference answer for what M321R4GA0BB0-CQK is, how it decodes and which siblings it is confused with. The alternatives section below shows what is currently buyable at the same capacity.
Because more than one organisation names it. The manufacturer assigns a model number describing the product; a server vendor buying it in volume assigns its own spare-part number for its service catalogue; distributors sometimes add another. All identify the same physical drive, which is why one number returns listings that look like a different product. Our part number index explains the pattern per vendor.