ASUS Intel LGA 1155 - Z68 PCIe 3.0 - SLI/CrossFireX Support Intel Z68 Micro ATX DDR3 2200 Motherboards Maximus IV Gene-Z/GEN3 2 x PCIe3.0/2.0 x16 slots (Single @x16 or dual @x8/x8 mode) with NVIDIA SLI/ AMD CrossFireX support 2 x SATA 6Gb/s ports 1 x Intel Gigabit LAN 4 DIMM, max up to 32GB, dual-channel DDR3 2200(O.C.)/2133(O.C.)/1866(O.C.)/1600/1333 Support SupremeFX X-Fi2 built-in 8-Ch. HD audio with EAX5.0 support 4 x USB 3.0/2.0 ports (2 ports at mid-board for front panel, 2 ports at back panel) 1 x HDMI port