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 compatible with intel® 05b/05a/06 processors supports intel® 45nm multi-core cpu chipset intel p45 / ich10r with intel® fast memory access(fma) support 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 expansion slots 1 x pci express 2.0 x16 slot at max. x16 link (blue) 1 x pci express 2.0 x16 slot at max. x8 link (white) 2 x pci express x16 slot at max. x4 link (black) 1 x pcie x1 2 x pci crossfire support ati crossfirex™ technology, up to quad crossfirex storage southbridge 6 xsata 3 gb/s ports intel® matrix storage technology support raid 0,1,5,10 marvell 88se6121 1 x ultradma 133/100/66 for up to 2 pata devices silicon image sil5723 (drive xpert technology) 4 x sata 3gb/s (orange and blue) supports ez backup and super speed functions lan quad gigabit lan controllers marvell 88e8056® gigabit lan controller featuring ai net 2, teaming, and redundant audio adi® ad2000b 8 -channel high definition audio codec - support jack-detection, multi-streaming, and front panel jack-retasking - coaxial/optical s/pdif out ports at back i/o - asus noise-filtering ieee 1394 lsi 3227 2 x 1394a ports usb 14 usb 2.0 ports (4 ports at mid-board, 10 ports at back panel) asus ai lifestyle features asus exclusive features: - asus 16-phase power design - express gate ssd asus power saving solutions: - asus epu-6 engine - asus ai nap asus quiet thermal solutions: - asus fanless design: heat-pipe solution - asus fanless design: stack cool 2 - asus fan xpert asus crystal sound: - ai audio 2 - asus noise filtering asus ez diy: - asus drive xpert - asus q-shield - asus q-connector - asus ai direct link - asus o.c. profile - asus crashfree bios 3 - asus ez flash 2 overclocking features asus ai booster precision tweaker 2: - vcore: adjustable cpu voltage at 0.00625v increment - vdimm: 64-step dram voltage control - vchipset (nb): 55-step chipset voltage control - vcpupll: 64-step reference voltage control - vfsb termination: 40-step voltage control sfs (stepless frequency selection) - fsb tuning from 200mhz up to 800mhz at 1mhz increment - pci express frequency tuning from 100mhz up to 180mhz at 1mhz increment overclocking protection: - asus c.p.r.(cpu parameter recall) special features asus mylogo2 asus data guardian-tpm support back panel i/o ports 1 x ps/2 keyboard/mouse combo port 1 x optical + 1 x coaxial s/pdif output 4 x lan (rj45) port 10 x usb 2.0/1.1 ports 8-channel audio i/o internal i/o connectors 2 x usb connectors support additional 4 usb ports 1 x floppy disk drive connector 1 x ide connector 1 x com connector 6 x sata connectors (red) 4 x drive xpert sata connectors (orange and blue) 1 x cpu fan connector 3 x chassis fan connector 1 x power fan connector 2 x ieee1394a connector front panel audio connector 1 x s/pdif out header chassis intrusion connector cd audio in 24-pin atx power connector 8-pin atx 12v power connector power on switch reset switch system panel (q-connector) bios 16 mb flash rom dmi 2.0 ami bios pnp wfm 2.0 sm bios 2.4 manageability wol by pme, wor by pme, wor by ring, chasis intrusion, pxe accessories 1 x ultradma 133/100/66 cable 1 x fdd cable 8 x serial ata cable 2 x 2-port serial ata power cable 1 x esata + 1-port 1394 (4-pin) module 1 x tpm module 1 x q-shield 1 x user's manual 1 x optional fan 1 x 3 in 1 q-connector (retail version only) support disc drivers asus pc probe ii asus ai suite anti-virus software (oem version) asus update image-editing suite form factor atx form factor 12 inch x 9.6 inch ( 30.5 cm x 24.4 cm )