| Part No. | R640 |
| Manufacturer | Dell Technologies |
| End of Life? | No |
| Rack Units | 1U |
| Depth | 705.5 |
| CPU Socket(s) | Up to two Intel® Xeon® Scalable processors, up to 28 cores per processor |
| Memory Slot(s) | 24 DDR4 DIMM slots, Supports RDIMM /LRDIMM, speeds up to 2933MT/s |
| Memory Capacity | 3TB |
| Memory Expansion | Up to 12 NVDIMM, 192 GB Max Up to 12 Intel® Optane™ DC persistent memory DCPMM, 6.14TB max, (7.68TB max with DPCMM + LRDIMM) Supports registered ECC DDR4 DIMMs only |
| Drive Bays | Front drive bays: Up to 10 x 2.5” SAS/SATA (HDD/SSD) with up to 8 NVMe SSD max 58TB or up to 4 x 3.5” SAS/SATA HDD max 48TB Rear drive bays: Up to 2 x 2.5” SAS/SATA (HDD/SSD), NVMe SSD max 12TB Optional DVD-ROM, DVD+RW |
| Supported OS | Canonical® Ubuntu® LTS Citrix® XenServer® Microsoft Windows Server® with Hyper-V Red Hat® Enterprise Linux SUSE® Linux Enterprise Server VMware® ESXi |
| USB Port(s) | Front: 1x USB 2.0, available USB 3.0, dedicated IDRAC Direct USB; Rear: 2x USB 3.0 |
| Serial Ports | Rear: 1x serial port |