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DDR4 ECC — Still the Mainstream
DDR4 ECC RDIMM remains the most cost-effective server memory option in 2026. Available in 16GB, 32GB, and 64GB modules at reasonable prices. Compatible with Intel Xeon Scalable (1st-3rd Gen) and AMD EPYC 7002/7003 platforms. For servers that do not need the latest platform, DDR4 ECC offers excellent value.
DDR5 ECC — Higher Performance
DDR5 ECC RDIMM delivers 1.5-2x the bandwidth of DDR4 ECC, with higher per-module capacities (up to 96GB RDIMM, 256GB LRDIMM). Required for Intel Xeon Scalable 4th/5th Gen and AMD EPYC 9004 platforms. The price premium is 40-60% over DDR4 equivalents, but new server purchases default to DDR5.
Recommendations by Platform
Dell PowerEdge R640/R650: DDR4-3200 ECC RDIMM 32GB (Samsung M393A4K40). Dell PowerEdge R660/R760: DDR5-4800 ECC RDIMM 32GB or 64GB. HP ProLiant DL360/DL380 Gen10: DDR4-2933 ECC RDIMM. HP ProLiant Gen11: DDR5-4800 ECC RDIMM.
| Module | Type | Buy |
|---|---|---|
| Samsung DDR4-3200 32GB ECC RDIMM | For DDR4 servers | Check Price |
| Samsung DDR5-4800 32GB ECC RDIMM | For DDR5 servers | Check Price |
Frequently Asked Questions
Can I mix DDR4 and DDR5 ECC in a server?
No. Servers support either DDR4 or DDR5, never both. Check your server model specifications.
Recommended Server & Workstation Memory
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How we verify this guide
We cross-reference compatibility figures against manufacturer specifications where available, official service manuals, and the standards that govern fit — memory type and speed (DDR4 / DDR5 / LPDDR5), maximum supported capacity and slot count, SSD form factor and interface (M.2 2280, NVMe PCIe vs SATA, keying), and charger wattage and connector (USB-C Power Delivery, GaN). We’re explicit about soldered or non-upgradeable parts, prioritise primary sources over retailer listings, and re-verify the data on a regular cycle. More on our method →
