Acer / Gateway ECS MCP61PM-GM AM2 mATX Motherboard 4006254R Intel Quad-core CPU Ready, LGA775 socket for Intel Core2 Duo, Core2 Extreme Intel 975X +Intel ICH7R 1066/800MHz Dual-channel DDR2 800/667/ 533 max 8GB Support ATI CrossFire graphics cards 2 x PCI-E x 16 / 2 x PCI-E x 1/ 3 x PCI