Socket am3 mainboard series msi 990 form factor atx supports multi core processors quadcore compatible cpus amd fx amd athlon ii amd phenom ii processor codename bulldozer chipset amd 990fx memory slot 4 ram operation mode dual channel ram type ddr3 memory clock speed 1 866 mhz memory clock speed oc max 2 133 mhz specification pc3 14900 specification oc max pc3 17000 maximum memory expansion 32 gb pcie 20 support number of pci x x 16 slots