MSI Computer Corp DDR2 667 LGA 775 Motherboard G41M-P33 COMBO Memory: 2x DDR2-1066(OC)/800/667 and 2x DDR3-1333(OC)/1066/800 DIMM Slots, Dual Channel, Unbuffered, Max Capacity? Of 8GB Slots: 1x PCI-Express x16 Slot, 1x PCI-Express x1 Slot, 1x 32-bit v2.3 PCI Slot IDE/SATA:1x ATA100 Port, 4x SATA2 Ports Ports: 8x USB 2.0 Ports (4 rear,?4 via headers), 1x PS/2 Keyboard Port, 1x PS/2 Mouse Port, 1x?Serial Port, 1x Parallel Port, 1x VGA Port, 1x RJ45 LAN Port, Audio I/O Jacks Memory Standard DDR2 1066(OC) / 800 / 667 USB 1.1/2.0 4 x USB 2.0