[ REGISTERED ECC SERVER MODULE // MEMORY / RAM ]
Samsung M393A4K40CB2-CTD
A 32 GB Samsung DDR4-2666 server RDIMM identified by its complete M393A4K40CB2-CTD part number. The registered interface and ECC check bits make this a server-memory module, not a desktop UDIMM.
PART ID: M393A4K40CB2-CTD. This is a specific manufacturer module, not a generic DIMM standard. Verify full label, revision and SPD data on the specimen before using it for a service or compatibility decision.
Module specifications
| Manufacturer / part number | Samsung M393A4K40CB2-CTD |
|---|---|
| Module class | 288-pin DDR4 ECC Registered DIMM (RDIMM) |
| Capacity | 32 GB per module |
| Memory generation / data rate | DDR4-2666 (2666 MT/s; PC4-21300) |
| Error correction / buffering | System-level ECC module; registered/buffered command-address interface (RDIMM) |
| Rank / device organization | 2Rx4 (dual rank, x4 DRAM organization); 2G x4 devices; x4 organization |
| Timing / voltage | CL19 at 1.2 V; nominal module voltage 1.2 V |
| Form factor | 288-pin DDR4 ECC Registered DIMM (RDIMM); contact count and keying are generation-specific |
| Compatibility | DDR4 server or workstation platforms that explicitly support 32 GB ECC RDIMMs with 2Rx4 organization. Confirm the exact host QVL, CPU memory controller, per-slot capacity and population rules; a host may operate below the module rating. |
Platform compatibility & service notes
DDR4 server or workstation platforms that explicitly support 32 GB ECC RDIMMs with 2Rx4 organization. Confirm the exact host QVL, CPU memory controller, per-slot capacity and population rules; a host may operate below the module rating.
- Match DDR generation, ECC and registered buffering independently; a mechanically similar UDIMM or LRDIMM is not interchangeable unless the host documentation explicitly allows it.
- Confirm CPU memory-controller capability, firmware, supported rank and DRAM density, maximum capacity per slot, and channel population rules in the server service manual and qualified-memory list.
- The printed transfer rate is a module rating. The configured rate can be lower because of the CPU, number of DIMMs per channel, ranks, firmware policy or other installed modules.
- Power down and follow the host service procedure. Use ESD precautions, handle by the edges and keep the original label and SPD record with the archived specimen.
Archival fields
Record the complete SKU, suffix and revision/date code; photograph both module sides; preserve SPD data, host model and CPU, BIOS/BMC version, socket/channel location, memory-test results and any ECC event counters. Reconfirm all traits against the physical sample because component revisions may vary.
Product sources & compatibility reference
- CompuRAM — Samsung M393A4K40CB2-CTD module detailsModel-level capacity, speed, rank and module type listing.
- CPU Medics — Samsung M393A4K40CB2-CTD server memoryIndependent SKU listing for ECC RDIMM type, capacity and data rate.
- Intel Xeon E5 processor families — memory system referenceExample host-platform reference for server memory. It does not qualify this exact SKU; the platform vendor’s service manual and QVL determine actual compatibility.
Model facts are taken from the linked part listings/datasheet. Server compatibility is conditional and must be checked against the actual CPU, board, firmware and server population guide.