Gigabyte Intel LGA 2011-3 X99 4way SLI/CrossFireX ATX Motherboards GA-X99-UD4 LGA 2011-v3 Chipset: Intel X99 Memory: 8x DDR4-2133/ 1866/ 1600/ 1333 DIMM Slots,Quad-Channel, Non-ECC, Max Capacity up to 64GB Slots: 4x PCI-Express 3.0 x16 Slots (two run at x8), 3x PCI-Express 2.0 x1 Slots, 1x M.2 Slot(M.2 Wi-Fi) Audio: Realtek ALC1150 7.1-Channel High Definition Audio CODEC, Support for S/PDIF Out LAN: Integrated Intel Gigabit Ethernet Controller Socket: LGA 2011-3 4 way SLI/CrossFireX 8 usb 3.0, 8 usb 2.0 Socket: LGA 2011-3 4 way SLI/CrossFireX 8 usb 3.0, 8 usb 2.0