MSI K9A2 Platinum AMD 790FX Phenom Socket AM2+ PC2-8500 DDR2-1066 ATX Motherboard 4 DIMMS w/ DDR2 1066+ up to 8GB 4 PCI-E 16X (Support 16x+16x in Dual CrossFire, 16x+8x+8x in Triple CrossFire, 8x+8x+8x+8x in Quad CrossFire) 1 PCI-E 1x 2 PCI 32-bit 10 USB ports