Samsung
64GB DDR4-3200 ECC Registered DIMM, 2Rx4, 288-pin, 1.2 V
The Samsung M393A8G40CB4-CWE is a 64GB dual-rank x4 DDR4 RDIMM (PC4-25600R) used widely in Intel Xeon Scalable and AMD EPYC servers still in service. With DRAM makers shifting capacity to DDR5 and HBM and winding down DDR4 RDIMM production, supply of qualified DDR4 server modules has tightened and prices have moved accordingly. Cerametronics supports maintenance and expansion builds with traceable stock and helps buyers plan around last-time-buy timing.
Key Specifications
Verify against the original datasheet before quoting.
| Capacity | 64GB, dual rank (2Rx4), ECC |
|---|---|
| Speed | DDR4-3200 (PC4-25600R), CL22 |
| Voltage | 1.2 V |
| Module type | 288-pin Registered DIMM (RDIMM) |
| Organization | 8G x72 module built on 4G x4 DRAM components |
Market Status — as of November 2026
Allocated – Limited Market Stock
Quality & Traceability
Cerametronics is ISO 9001 certified and products are RoHS compliant, with counterfeit screening and full traceability on every shipment. A Certificate of Conformance is available on request. For allocation-sensitive or high-risk lots, independent third-party lab verification can be arranged — just flag it on your RFQ. Any lot that fails incoming inspection is quarantined and never shipped.
FAQ
Which servers use the M393A8G40CB4-CWE?
It is a standard JEDEC DDR4-3200 RDIMM used in many dual-socket Intel Xeon Scalable and AMD EPYC platforms. Always confirm the part is on your server vendor's qualified memory list.
Why is DDR4 RDIMM supply getting tight?
Memory makers are moving wafer capacity to DDR5 and HBM and reducing DDR4 output, so qualified DDR4 server modules for installed platforms are harder to secure through authorized channels.
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Cerametronics is an independent electronic components distributor and is not affiliated with Samsung. All trademarks belong to their respective owners.
