CPU Intel Socket 775 Core2 Quad/Core2 Extreme/Core2 Duo/Pentium D/Celeron dual-core / Celeron Processors Compatible with Intel 05B/05A/06 processors Supports Intel 45nm Multi-Core CPU Chipset Intel P45 / ICH10 with Intel Fast Memory Access Technology Front Side Bus 1600/1333/1066/800 MHz Memory 4 x DIMM, Max. 16 GB, DDR2 1200*/1066/800/667 Non-ECC,Un-buffered Memory Dual Channel memory architecture *Refer to www.asus.com or this user manual for the Memory QVL(Qualified Vendors Lists). **Due to OS limitation, when installing total memory of 4GB capacity or more, Windows 32-bit operation system may only recognize less than 3GB. Hence, a total installed memory of less than 3GB is recommended Expansion Slots 1 x PCIe 2.0 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 port for up to 2 PATA devices LAN Realtek Gigabit LAN controller featuring AI NET 2 Audio VIA VT1708s 8 -Channel High Definition Audio CODEC - Support, Multi-streaming - Optical S/PDIF out port at back I/O - ASUS Noise Filtering USB 12 USB 2.0 ports (6 ports at mid-board, 6 ports at back panel) ASUS Unique Features ASUS Power Saving Solution: - 8-Phase Power Design - ASUS EPU- 4 Engine - ASUS AI Nap ASUS Exclusive Features: - ASUS Express Gate ASUS Quiet Thermal Solution: - ASUS Fanless Design: heatsink solution - ASUS Fan Xpert ASUS EZ DIY: - ASUS Q-Connector - ASUS O.C. Profile - ASUS CrashFree BIOS 3 - ASUS EZ Flash 2 Overclocking Features Intelligent overclocking tools - ASUS AI Booster Utility Precision Tweaker - vDIMM: 6 -step DRAM voltage control - vCore: Adjustable CPU voltage at 6.25 mV increment SFS (Stepless Frequency Selection) - FSB tuning from 200MHz up to 800MHz at 1MHz increment - PCI Express frequency tuning from 100 MHz up to 180 MHz at 1MHz increment Overclocking Protection - ASUS C.P.R.(CPU Parameter Recall) Special Features ASUS MyLogo 2 Back Panel I/O Ports 1 x PS/2 Keyboard port 1 x PS/2 Mouse port 1 x S/PDIF Out (Optical) port 1 x RJ45 port 6 x USB 2.0/1.1 ports 8-channel Audio I/O ports Internal I/O Connectors 3 x USB connectors support 6 additional USB ports 1 x Floppy disk drive connector 1 x IDE connector 1 x COM connector 6 x SATA connectors 1 x CPU Fan connector 1 x Chassis Fan connector 1 x Power Fan connector 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 1 x UltraDMA 133/100/66 cable 2 x Serial ATA cables I/O Shield User's manual 2 in 1 Q-connector Support Disc Drivers ASUS PC Probe II ASUS Update ASUS AI Suite Anti-virus software (OEM version) Form Factor ATX Form Factor 12 x 7.8 ( 30.5 cm x 19.8 cm )