Samsung · DDR4 RDIMM
M393A8G40AB2-CWE is Samsung DDR4 RDIMM 64GB DDR4-3200. 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. 1 live listing below.
| Segment | What it means | Source |
|---|---|---|
| M | Samsung memory module prefix. | Samsung |
| 393 | DDR4 Registered DIMM (RDIMM). | Samsung |
| A8G40AB2 | Not sourced - we have not found a Samsung document defining this segment. | Not sourced |
| CWE | 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.
M393A8G40AB2-CWE is Samsung DDR4 RDIMM, a 64GB server memory module on DDR4-3200. 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 currently track 1 live listing against this exact part number, offered both new and refurbished (the table shows each listing's cheapest offer), and the two frequently carry different warranty positions even when the part number is identical. 5 sibling part numbers are documented below - these are the numbers most often mistaken for this one, and the table marks which fields actually differ.
| Manufacturer | Samsung |
| Family | Samsung DDR4 RDIMM |
| Capacity | 64GB |
| Interface | DDR4-3200 |
| Product class | RAM |
These are the part numbers most often confused with M393A8G40AB2-CWE. The differences below come from the same vendor documentation as the decode above - where a field is not documented, the row leaves it blank rather than guessing.
| Part number | Capacity | Interface | Format | |
|---|---|---|---|---|
| M393A2G40EB1-CPB | 16GB | DDR4-2133 | in catalogue | |
| M393A4K40CB1-CRC | 32GB | DDR4-2400 | in catalogue | |
| M393A4K40CB2-CTD | 32GB | DDR4-2666 | in catalogue | |
| M393A8G40BB4-CWE | 64GB | DDR4-3200 | in catalogue | |
| M393A8K40B22-CWD | 64GB | DDR4-2666 | in catalogue |
Amber cells differ from M393A8G40AB2-CWE; grey cells match it.
| Listing | Condition | Pack | $/TB | Price | |
|---|---|---|---|---|---|
| Samsung 64GB DDR4-3200 ECC RDIMM | Refurb | single | $12800.00 | $800.00 | Buy on Amazon |
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 memory support 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 · same capacity and interface, any part number · ranked by live cost per gb, refreshed about once a day
| Drive | Capacity | Condition | $/GB | Price | |
|---|---|---|---|---|---|
| Samsung 64GB DDR4-2666 ECC RDIMM M393A8K40B22-CWD | 64GB | NEW | $6.23 | $399 | Buy on Amazon |
| A-Tech 64GB DDR4-2666 ECC LRDIMM B0BPN414ZJ | 64GB | NEW | $6.41 | $410 | Buy on Amazon |
| A-Tech 64GB DDR4-2933 ECC RDIMM B0C2FML23M | 64GB | NEW | $10.06 | $644 | Buy on Amazon |
| A-Tech 64GB DDR4-2933 ECC RDIMM KTD-PE429 | 64GB | NEW | $10.33 | $661 | Buy on Amazon |
Product pages for M393A8G40AB2-CWE: Samsung 64GB DDR4-3200 ECC RDIMM. Each carries that listing's own condition, provenance and alternatives; the priced table above is in-stock offers only.
M393A8G40AB2-CWE is Samsung DDR4 RDIMM 64GB DDR4-3200. 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.
The part number cannot tell you - coverage follows how the unit entered the market, not its designation. Of the 1 live listing we track for M393A8G40AB2-CWE, 1 is sold new and the rest used or recertified, and only the new units can carry Samsung's own cover. Check the specific serial with Samsung's own tool, linked in the warranty section on this page.
M393A8G40AB2-CWE and M393A2G40EB1-CPB are both in the Samsung DDR4 RDIMM range. The clearest difference is capacity - 64GB against 16GB. They differ in interface: DDR4-3200 against DDR4-2133, which decides whether the drive fits your controller. The variant table on this page lists every sibling we document with what differs.
We track 1 live listing carrying this part number, shown above with condition and cost per terabyte; the cheapest sits under ASIN B09C7MP442. Prices come from Amazon US, re-checked about once a day per listing; the buy links go to the live listing because the price can change between our check and your click.