Specifications CPU Intel® Socket 775 Core™2 Quad/Core™2 Extreme/Core™2 Duo Support Intel next generation 45nm multi-core CPU Intel Hyper-Threading Technology ready Support Enhanced Intel SpeedStep Technology (EIST) Chipset Intel® G31 / ICH7 Front Side Bus 1333/1066/800 MHz Memory 4 x 240-pin DIMM, Max. 4 GB, DDR2 800/667 Non-ECC,Un-buffered Memory Dual Channel memory architecture Expansion Slots 1 x PCIe x16 5 x PCIe x1 Storage Intel ICH7 controller 1 xUltraDMA 100/66 4 xSATA 3 Gb/s ports LAN Gb Lan Audio VT1705 High Definition Audio 6-Channel CODEC Audio Jack-detect Technology USB 8 USB 2.0/1.1 ports (4 ports at mid-board, 4 ports at back panel) ASUS Unique Features ASUS CrashFreeBIOS3 ASUS EZ Flash2 ASUS Q-Fan ASUS MyLogo2 AI Net2 Back Panel I/O Ports 1 x VGA 1 x PS/2 Keyboard 1 x PS/2 Mouse 1 x LAN(RJ45) port 4 x USB 2.0/1.1 1 x COM port 6 -Channel Audio I/O 1 x Printer Port (optional) Internal I/O Connectors 2 x USB connectors supports additional 4 USB 2.0 ports 1 x Azalia High definition Analog Front panel Audio connector 1 x Front Panel connector CPU/Chassis/Power Fan Connector 1 x Chassis Intrusion 1 x COM 24-pin EATX12V Power connector 4-pin ATX 12V Power connector BIOS 8 Mb Flash ROM , AMI BIOS, Special H/W write production, PnP, DMI v2.0, WfM2.0, SMBIOS v2.5, ACPI v2.0a Accessories User's manual 1 x I/O Shield 1 x SATA cable(s) 1 x UltraDMA 100/66 cable Support Disc Drivers ASUS PC Probe II Anti-virus software (OEM version) ASUS LiveUpdate Utility Form Factor ATX Form Factor 12 inch x 8 inch ( 30.5 cm x 20.3 cm )