CPU Intel Socket 775 Core2 Quad/Core2 Extreme/Core2 Duo/Pentium dual-core/Celeron dual-core /Celeron Processors Support Intel 45nm Multi-Core CPU Compatible with Intel 05B/05A/06 processors Chipset Intel P43 / ICH10 with Intel Fast Memory Access Technology Front Side Bus 1600(O.C)/1333/1066/800 MHz Memory 4 x DIMM, Max. 16 GB, DDR2 1066/800/667 Non-ECC,Un-buffered Memory Dual Channel memory architecture Expansion Slots 1 x PCIe x16 2 x PCIe x1 3 x PCI Storage Southbridge 6 xSATA 3 Gb/s ports JMicron JMB368 PATA controller 1 xUltraDMA 133/100/66 for up to 2 PATA devices LAN PCIe Gb LAN controller featuring AI NET 2 Audio Realtek ALC 1200, 8-Channel High-Definition Audio CODEC - Support Jack Detection and Multi-streaming - Coaxial S/PDIF out ports at back I/O - ASUS Noise Filter USB 12 USB 2.0/1.1 ports (6 ports at mid-board, 6ports at back panel) ASUS Unique Features ASUS Power Saving Solution - ASUS EPU- 4 Engine ASUS AI Lifestyle - ASUS Express Gate ASUS Quiet Thermal Solution - ASUS Fan Xpert ASUS Crystal Sound - ASUS Noise Filter ASUS EZ DIY - ASUS Q-Connector - ASUS O.C. Profile - ASUS CrashFree BIOS 3 - ASUS EZ Flash 2 Overclocking Features Precision Tweaker - vDIMM: 5 -step DRAM voltage control - vCore: Adjustable CPU voltage at 6.25mV increment SFS (Stepless Frequency Selection) - FSB tuning from 200MHz up to 800MHz at 1MHz increment - Memory tuning from 667MHz up to 1333MHz for DDR2 - PCI Express frequency tuning from 100MHz up to 180MHz at 1MHz increment Overclocking Protection - ASUS C.P.R.(CPU Parameter Recall) Special Features ASUS MyLogo 2 100% All High-quality Conductive Polymer Capacitors Back Panel I/O Ports 1 x PS/2 Keyboard 1 x PS/2 Mouse 1 x S/PDIF Out (Coaxial) 1 x LAN(RJ45) port 6 x USB 2.0/1.1 8 -Channel Audio I/O Internal I/O Connectors 3 x USB connectors support additional 6 USB ports 1 x Floppy disk drive connector 1 x IDE connector 1 x CPU Fan connector 1 x Chassis Fan connector 1 x Power Fan connector 1 x COM connector 6 x SATA connectors Front panel audio connector 1 x S/PDIF Out Header Chassis Intrusion connector CD audio in 24-pin ATX Power connector 1 x 4-pin ATX 12V Power connector System Panel(Q-Connector) BIOS 8 Mb Flash ROM , AMI BIOS, PnP, DMI2.0, WfM2.0, SM BIOS 2.3, ACPI 2.0a, ASUS EZ Flash 2, ASUS CrashFree BIOS 3 Manageability WfM 2.0,DMI 2.0,WOL by PME,WOR by PME,PXE Accessories User's manual 1 x I/O Shield 1 x UltraDMA 133/100/66 cable 2 x SATA cable(s) 2 in 1 Q-connector Support Disc Drivers ASUS PC Probe II ASUS AI Suite Anti-virus software (OEM version) ASUS Update Form Factor ATX Form Factor 12 inch x 7.6 inch ( 30.5 cm x 19.3 cm )