specification cpu intel socket 775 processors for intel® core™2 extreme / core™2 quad / core™2 duo / pentium® dual-core/celeron® dual-core /celeron® processors support intel® next generation 45nm multi-core cpu compatible with intel® 06/05b/05a processors chipset intel p45 / ich10r with intel® fast memory access technology front side bus 1600/1333/1066/800 mhz memory 4 x240-pin dimm, max. 16 gb, ddr2 1200/1066/800/667 non-ecc,un-buffered memory expansion slots 2 x pcie 2.0 x16 (single max @16,dual @ x8 speed) 3 x pcie x1 ( the pciex1_1 (black) is compatible with audio slot) 2 x pci 2.2 crossfire support ati crossfirex™ technology, up to quad crossfirex storage southbridge 6 xsata 3 gb/s ports intel matrix storage technology supports support raid 0,1,5,10 marvell® 88se6121 controller 1 x ultradma 133/100/66/33 for up to 2 pata devices 1 x external sata 3.0 gb/s port (sata on-the-go) silicon image sil5723 2 x sata 3.0 gb/s ports supports raid 0, 1 lan dual gigabit lan, both featuring ai net2 support teaming technology audio supremefx x-fi audio card - adi® ad2000b 8-channel high definition audio codec - creative x-fi capability - x-fi interface coaxial/optical s/pdif out ports ieee 1394 2 x 1394a ports (1 port at back i/o, 1 port onboard) usb 12 usb 2.0 ports (6 ports at mid-board, 6 ports at back panel) overclocking features pin fin thermal module extreme engine - 16-phase power design for cpu - 3-phase power design for north bridge - 2-phase power design for memory bios flashback irog extreme tweaker - cpu level up - ai overclocking (intelligent cpu frequency tuner) - asus ai booster utility - o.c profile speeding hdd voltiminder led cop ex (component overheat protection - ex) asus c.p.r.(cpu parameter recall) loadline calibration special features lcd poster onboard switches: power / reset / cls cmos (at rear) asus epu-6 engine asus fan xpert asus q-connector asus q-shield asus ez flash 2 asus crashfree bios 3 asus mylogo3 back panel i/o ports 1 x ps/2 keyboard port(purple) 1 x esata port 2 x lan (rj45) ports 6 x usb 2.0/1.1 ports 1 x ieee1394a port 1 x clr cmos switch internal i/o connectors 3 x usb 2.0 connectors supports additional 6 usb 2.0 ports 1 x floppy disk drive connector 1 x ide connector for two devices 6 x sata connectors (blue) 2 x speeding hdd connectors (black) 8 x fan connectors: 1 x cpu / 1 x pwr / 3 x chassis / 3 x optional 3 x thermal sensor connectors 1 x ieee1394a connector 1 x chassis intrusion connector 24-pin atx power connector 8-pin atx 12v power connector 1 x en/dis-able clr cmos 1 x lcd poster connector 1 x rog connector 1 x power-on switch 1 x reset switch system panel connector bios 16 mb flash rom dmi 2.0 ami bios pnp wfm 2.0 sm bios 2.4 acpi 2.0a multi-language bios manageability wol by pme,wor by pme,chasis intrusion,pxe accessories supremefx x-fi audio card lcd poster asus optional fan 3 in 1 asus q-connector kit ultradma 133/100/66 cable floppy disk drive cable sata cables sata power cables 2-port usb2.0 + ieee 1394a module q-shield cable ties user's manual support disc support dvd: - drivers and applications - asus pc probe ii - asus update - asus ai suite - futuremark ® 3dmark® 06 advanced edition - kaspersky® anti-virus form factor atx form factor 12 inch x 9.6 inch ( 30.5 cm x 24.5 cm