specification cpu intel socket 775 core™2 quad/core™2 extreme/core™2 duo/pentium® extreme/pentium® d/pentium® 4 processors compatible with intel® 05b/05a/06 processors support intel® 45nm cpu chipset intel x48 intel ch9r intel fast memory access technology front side bus 1600/1333/1066/800 mhz memory 4 x dimm, max. 8 gb, ddr2 1200*/1066/800/667 ecc,non-ecc,un-buffered memory dual channel memory architecture *ddr2 1200 is o.c. speed expansion slots 2 x pcie 2.0 x16 (both @ x16 mode) supports crossfire technology 3 x pcie x1 ( the pciex1_1 (black) is compatible with audio slot) 2 x pci crossfire support ati crossfire graphics cards storage southbridge 6 xsata 3 gb/s ports intel matrix storage technology support raid 0,1,5,10 jmicron® jmb368 pata controller 1 xultradma 133/100/66/33 for up to 2 pata devices lan marvell88e8056® pcie gigabit lan controller featuring ai net2 audio supremefx ii audio card adi® ad1988b 8 -channel high-definition audio codec coaxial / optical s/pdif out ports at back i/o asus noise filter ai audio 2 ieee 1394 via vt6308p controller supports 2 x 1394a ports (one at midboard; one at back panel) usb 12 usb 2.0 ports (6 ports at mid-board, 6 ports at back panel) asus ai lifestyle features asus power saving solution - asus epu (energy processing unit) - asus 3rd generation 8-phase power - asus ai nap asus quiet thermal solution - asus fanless design: pure copper heat-pipe solution - asus fanless design: stack cool 2 - asus q-fan 2 - asus optional fan for water-cooling or passive-cooling only asus ez diy - asus q-connector - asus q-shield - asus o.c. profile - asus crashfree bios 3 - asus ez flash 2 overclocking features intelligent overclocking tools - asus ai booster utility - 2-phase ddr2 precision tweaker 2 - vdimm: 43 -step dram voltage control - vcore: adjustable cpu voltage at 0.00625v increment - vchipset (n.b.): 25-step voltage control - vfsb termination: 15-step voltage control - vcpu pll: 64-step voltage control sfs (stepless frequency selection) - fsb tuning from 200mhz up to 800mhz at 1mhz increment - memory tuning from 667mhz up to 3200mhz - pci express frequency tuning from 100mhz up to 150mhz at 1mhz increment overclocking protection - asus c.p.r.(cpu parameter recall) special features multi-language bios asus mylogo 3 back panel i/o ports 1 x ps/2 keyboard 1 x s/pdif out 1 x ieee 1394a 1 x lan(rj45) port 6 x usb 2.0/1.1 internal i/o connectors 3 x usb connectors support additional 6 usb ports 1 x floppy disk drive connector 1 x ide connector 6 x sata connectors 1 x ieee 1394a connector 1 x cpu fan connector 1 x chassis fan connector 1 x power fan connector 1 x s/pdif out connector 2 x4-pin atx 12v power connector 24-pin atx power connector front panel audio connector chassis intrusion connector cd/aux audio in system panel bios 16 mb flash rom dmi 2.0 ami bios pnp wfm 2.0 sm bios 2.3 acpi 2.0a multi-language bios asus ez flash 2 asus crashfree bios 3 manageability wfm 2.0,dmi 2.0,wol by pme,wor by pme, pxe accessories ultradma 133/100/66 cable fdd cable 6 x serial ata cables 1 x 2-port serial ata power cable asus q-shield user's manual 3 in 1 q-connector 1 x 2-port usb2.0 / 1-port ieee1394 module 1 x optional fan for water-cooling or passive-cooling only supremefx ii audio card 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 )