Both have similar specifications and feature four PCI Express x16 slots, but the Crosshair V Formula comes with a better audio codec, two additional USB 30 ports, better networking chip, and moreROG Crosshair V FormulaZ features the 990FX chipset, Windows 8 support, plus new exclusive ROG audio and networking features Please visit the ASUS USA and ASUS Canada websites for information about locally available products All specifications are subject to change without notice Please check with your supplier for exact offersSpecs ASUS Crosshair V FormulaZ AM3 AMD 990FX SATA 6Gbps USB 30 ATX AMD Gaming Motherboard with 3Way SLI / CrossFireX Support and UEFI BIOS The Republic of Gamers consists of only "the best of the best" We offer the best hardware engineering, the fastest performance, and the most innovating ideas, and we welcome the best gamers to join in Amazon Com Asus Crosshair V Formula Z Am3 Amd 990fx Sata 6gb S Usb 3 0 Atx Amd Motherboard Computers Accessories Asus crossh...