ASUS P9X79 LGA 2011 Intel X79 SATA 6Gb/s USB 3.0 ATX Intel Motherboard 8 x DIMM Slots, Quad-channel DDR3 2400(O.C.)/2133(O.C.)/1866/1600/1333/1066 MHz Support Digital 8+2 Phase Power Design 2 x PCIe 3.0 x16 (dual@x16) AMD Quad-GPU CrossFireX and NVIDIA Quad-GPU SLI support 1 x COM connector + 1 x TPM header 1 x 1394a port LAN featuring Intel 82579V Chipset CH High Definition Audio, DTS Connect, DTS Ultra PC II