A-Tech · A-Tech DDR4 RDIMM
M393A2G40DB0-CPB is A-Tech A-Tech DDR4 RDIMM 16GB DDR4-2133. 2 of its 4 segments are defined in A-Tech's published documentation and decoded below; the rest are not publicly documented and 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 |
| A2G40DB0 | A-Tech does not publicly document this segment. | not documented |
| CPB | A-Tech does not publicly document this segment. | not documented |
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 A-Tech - 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.
M393A2G40DB0-CPB is A-Tech A-Tech DDR4 RDIMM, a 16GB server memory module on DDR4-2133. 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. 1 sibling part number is documented below - these are the numbers most often mistaken for this one, and the table marks which fields actually differ.
| Manufacturer | A-Tech |
| Family | A-Tech DDR4 RDIMM |
| Capacity | 16GB |
| Interface | DDR4-2133 |
| Product class | RAM |
These are the part numbers most often confused with M393A2G40DB0-CPB. 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 | |
|---|---|---|---|---|
| MTA36ASF8G72PZ | 64GB | DDR4-3200 | in catalogue |
Amber cells differ from M393A2G40DB0-CPB; grey cells match it.
| Listing | Condition | Pack | $/TB | Price | |
|---|---|---|---|---|---|
| A-Tech 16GB DDR4-2133 ECC RDIMM | New | single | $4638.72 | $72.48 | Buy |
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 and check it with A-Tech directly before buying. We do not link a checker for this manufacturer because we have not verified one.
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, any part number · ranked by live cost per gb, refreshed every few hours
| Drive | Capacity | Condition | $/GB | Price | |
|---|---|---|---|---|---|
| A-Tech 16GB DDR4-2133 ECC RDIMM M393A2G40DB0-CPB | 16GB | NEW | $4.53 | $72 | Buy |
| Samsung 16GB DDR4-2133 ECC RDIMM M393A2G40EB1-CPB | 16GB | NEW | $5.76 | $92 | Buy |
| Samsung 16GB DDR4-2666 ECC RDIMM M393A2K43CB2-CTD8Q | 16GB | NEW | $8.38 | $134 | Buy |
| Samsung 16GB DDR4-2666 ECC RDIMM M393A2K43BB1-CTD6Q | 16GB | NEW | $10.97 | $175 | Buy |
M393A2G40DB0-CPB is A-Tech A-Tech DDR4 RDIMM 16GB DDR4-2133. 2 of its 4 segments are defined in A-Tech's own published documentation - the decode table on this page shows each one with the document that defines it. The remaining segments are not publicly documented, 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 the manufacturer before buying.
Both are in the A-Tech DDR4 RDIMM range. The clearest difference is capacity - 16GB against 64GB. They differ in interface: DDR4-2133 against DDR4-3200, 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. Prices come from Amazon US and are re-checked continuously; the buy links go to the live listing because the price can change between our check and your click.
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.