Masterful performance and incomparable reliability distinguish this terrific Socket 939 motherboard from other platforms in its price range. The Mach Speed Viper MK8-939A is flawlessly engineered to work perfectly with systems running on AMD Athlon 64/FX/X2 processors up to an astonishing 1GHz bus speed. The Mach Speed Viper MK8-939A supports PCI Ex 16x and 1x, 4 DIMM slots of DDR 400 dual channel memory up to 4GB, SATA, RAID 0, RAID1, RAID 0+1, 10/100 LAN, USB 2.0, 6-channel audio and SPDIF out. Based on the VIA K8T890, the MK8-939A is the ideal mainboard for a fast, powerful system with fantastic multimedia options. Backed by Mach Speed's unique Lifetime Warranty, the MK8-939A offers unsurpassed quality and dependability at our unbeatable price.