Memory 2x DDR2-1066OC800667 and 2x DDR3-1333OC1066800 DIMM Slots Dual Channel Unbuffered Max Capacity Of 8GB Slots 1x PCI-Express x16 Slot 1x PCI-Express x1 Slot 1x 32-bit v23 PCI Slot IDESATA1x ATA100 Port 4x SATA2 Ports Ports 8x USB 20 Ports 4 rear4 via headers 1x PS2 Keyboard Port 1x PS2 Mouse Port 1xSerial Port 1x Parallel Port 1x VGA Port 1x RJ45 LAN Port Audio IO Jacks Memory Standard DDR2 1066OC 800 667 USB 1120 4 x USB 20