PowerEdge R640 Rack Server Specification Table Item Specification Form Factor 1U Rack Server, 2-socket Processor Up to 2 × 2nd Generation Intel® Xeon® Scalable processors, max 28 cores per CPU Chipset Intel® C620 Series Chipset Memory 24 × DDR4 DIMM slots; RDIMM/LRDIMM/NVDIMM/Intel Optane DC Persistent Memory; speed up to 2933 MT/s; Max 3TB (LRDIMM) / 1.53TB (RDIMM) Drive Bays Front: Up to 10 × 2.5” SAS/SATA/NVMe SSD/HDD (max 8 NVMe), or 4 × 3.5” SAS/SATA HDDRear: Optional up