Specifications Chip X399 Form Factor ATX Memory Type " Quad Channel DDR 4 2667" Memory Socket DDR 4*8 Graphics Interface PCI-E 3.0 x 16 PCI-E X16 X8 X4 "2 x PCI Express x 16 slots, running at x 16 2 x PCI Express x 16 slots, running at x 8 1 x PCI Express x 16 slots, running at x 4" SLI / Cross Fire "4 way SLI / 4 way Cross Fire" USB (Universal Serial Bus) ports rear "1 USB (Universal Serial Bus) 3.1 Type C 1 USB 3.1 Gen 2 6 USB (Universal Serial Bus) 3.1 Gen 1" USB (Universal Serial Bus) ports via headers "2 USB (Universal Serial Bus) 2.0 (Headers) 2 USB (Universal Serial Bus) 3.1 (Headers)" M.2 Slot 2 RAID RAID 0/1/10/JBOD Audio Realtek ALC1220 LAN " Killer E2500 & Wifi (10/100/1000 Mbit)"