Intel S5520SC Refresh CPU Socket Type: Dual LGA 1366 CPU Type: Dual Intel Xeon 5600/5500 Series Memory: 12 x 240pin DDR3 1333; 192GB max Slots: 2 PCI Express 2.0 x16; 1 x PCI Express 1.0 x4 slot (x8 mechanical shared with optional SAS module); 1 x PCI Express x1 (x4 mechanical); 1 PCI Slots; SATA: 6 SATA 3.0Gb/s Ports: 4 x USB 2.0; 1 x IEEE 1394a