Socket am3 mainboard series asus m5a99x form factor atx supports multi core processors 8 core compatible cpus amd phenom ii amd athlon ii amd sempron 100 amd fx processor codename bulldozer chipset amd 990x quickpath interface 52 gts memory slot 4 ram operation mode dual channel ram type ddr3 memory clock speed 2 133 mhz specification pc3 17000 pcie 20 support number of pci x x 16 slots 3 number of pci x x 1 slots 2 number of pci slots 1 x pc