Mfr Part Number: SPC621D8-2L2T Form Factor: ATX CPU: Supports 3rd Gen Intel Xeon Scalable processors Socket: Single Socket P+ (LGA 4189) Chipset: Intel C621A System Memory: Supported DIMM Quantity: 8 DIMM slots (1DPC) Supported Type: Supports DDR4 288-pin RDIMM, LRDIMM, RDIMM/LRDIMM-3DS, Intel Optane Persistent Memory 200 series Max. Capacity per DIMM - RDIMM: up to 64GB - RDIMM-3DS: up to 256GB - LRDIMM: up to 128GB - LRDIMM-3DS: up to 256GB DIMM Frequency: max. 3200MHz Voltage: 1.2V PCIe Expansion Slots (SLOT7 close to CPU): PCIe x 16: SLOT7: PCIe4.0 x16, SLOT5: PCIe4.0 x16, SLOT3: PCIe4.0 x16, SLOT1: PCIe4.0 x16 (SLOT7/5/3 auto-switch to PCIe4.0 x8 when SLOT6/4/2 occupied) PCIe x 8: SLOT6: PCIe4.0 x8, SLOT4: PCIe4.0 x8, SLOT2: PCIe4.0 x8