Intel® Socket 1366 Core™ i7 Processor Extreme Edition/Core™ i7 Processor/ , Dual Cores/Quad Cores/Six Cores CPU Support, Intel® X58 / ICH10R, 6 x DIMM, Max. 24 GB, DDR3 2000(O.C.)*/1866(O.C.)*/1800(O.C.)*/1600(O.C.)/1333/1066 ECC,Non-ECC,Un-buffered Memory, 2 x PCIe 2.0 x16 (at x16 / x16 mode), 1 x PCIe x1,1 x PCI 2.2, 2 x PCI-X, Supports NVIDIA® 2-Way Geforce SLI or Quad-GPU SLI™ Technology*, Supports ATI® CrossFireX™ Technology, 6 xSATA 3 Gb/s ports, Intel® Matrix Storage Support RAID 0,1,5,10, 2 x SAS ports supporting SAS RAID 0, 1, 2 xExternal SATA 150/300 (SATA On-the-G0), supporting SATA RAID 0, 1,2 x Realtek® 8111C PCIe Dual Gigabit LAN controllers, ADI 2000B, 8-Channel High Definition Audio CODEC , 12 USB 2.0/1.1 ports, G.P. Diagnosis Card bundled, ASUS SASsaby Cards support, ASUS WS Diag. LED, ASUS WS Heartbeat, SAS Onboard, ATX Form Factor