CPU - Intel Socket 775 Pentium® 4/Celeron Processors Intel® Hyper-Threading Technology ready Compatible with Intel 04B and 04A processors Chipset Intel 915P Intel ICH6R Front Side Bus 800/533/ MHz Memory Dual Channel memory architecture - 2 x 240-pin DIMM sockets support max. 2GB DDR2 600/533/400 non-ECC memory - 4 x 184-pin DIMM Sockets support max. 4GB DDR 400/333 non-ECC memory (Note: DDR and DDR2 memory can not be used simultaneously) - ASUS Hyper Path2 Expansion Slots 1 x PCIe x16 slot for discrete graphics card 2 x PCIe x1 3 x PCI Storage Southbridge 1 xUltraDMA 100/66/33 4 xSATA 3 Gb/s ports Support RAID 0,1, LAN Marvell 88E8053 PCIe Gigabit/ LAN Controller, features AI NET2 Audio C-Media High Definition Audio 8 -Channel CODEC S/PDIF out on back I/O port Features Dolby Digital Live technology USB 8 USB 2.0 ports ASUS AI Proactive Features AI NOS (Non-delay Overclocking System) AI NET2 network diagnosis before entering OS Overclocking Features Intelligent overclocking tools - ASUS CPU Lock Free - ASUS PEG Link - AI Overclocking (intelligent CPU frequency tuner) - ASUS AI Booster Utility - ASUS AI NOS (Non-delay Overclocking System) - CPU, Memory, and PCIe x16 voltage adjustable SFS (Stepless Frequency Selection) - FSB tuning from 100MHz up to 400MHz at 1MHz increment - Adjustable FSB/DDR ratio. Fixed PCI/PCIe frequencies Overclocking Protection - ASUS C.P.R.(CPU Parameter Recall) Special Features ASUS MyLogo ASUS CrashFree BIOS 2 ASUS Q-Fan BIOS 4 Mb Flash ROM DMI 2.0 AMI BIOS PnP WfM 2.0 SM BIOS 2.3 Back Panel I/O Ports 1 x Parallel 1 x PS/2 Keyboard 1 x PS/2 Mouse 1 x External SATA 1 x S/PDIF Out 2 x LAN(RJ45) port 4 x USB 2.0/1.1 8 -Channel Audio I/O Accessories User's manual x UltraDMA 133/100/66 cables x Floppy disk drive cables x SATA cables I/O Shield 1 x COM Port module Form Factor ATX Form Factor 12inchx9.6inch ( 30.5cmx24.5cm )