The R640 is Dell's 1U dual-socket workhorse of the 14th generation — dense compute for virtualization and general workloads, and one of the most traded used servers worldwide.
Knowledge pages are educational references, independent of sales inventory. Items without confirmed sourcing are reference-spec — quoted on demand.
Virtualization clusters, web/app tiers, branch compute; anywhere rack space matters more than expansion.
| CPU support | Intel Xeon Scalable 1st/2nd Gen (Skylake-SP / Cascade Lake), 2 sockets |
|---|---|
| Memory platform | 24 × DDR4 RDIMM/LRDIMM slots; DDR4-2666 with 1st Gen CPUs, DDR4-2933 with 2nd Gen; up to 3TB with LRDIMMs |
| Drives & RAID | 8–10 × 2.5" SAS/SATA/NVMe · PERC H730P/H740P RAID |
| PCIe & accelerators | Up to 3 PCIe 3.0 slots; low-profile only — no double-width GPU support in 1U |
| Power & networking | Dual hot-plug PSU 495W–1100W · 4 × 1GbE or 10GbE NDC options |
RDIMM and LRDIMM must not be mixed. 2933 modules on 1st Gen CPUs clock down to 2666. Populate channels evenly (6-channel CPUs) for full bandwidth.
vs R740: same platform in 2U with far more drive bays and PCIe slots. Choose R640 for density, R740 for expansion.
This platform takes the 32GB DDR4 ECC RDIMMs we regularly source and quote — see part numbers & availability, or ask for a free compatibility check with your RFQ.