Model Number : N50 > N50-AS031C N50-123456 N50-234567 CPUIntel® Quad-core CPU ReadyLGA775 socket for Intel® Pentium Processor Extreme Edition / Pentium D / Pentium 4 / Celeron CPUSupport Intel 65nm, Core™2 Extreme / Core™2 Duo Support Intel next generation Mulit-Core CPUCompatible with Intel 06B, 05B/ 05A and 04B/04A processorsIntel EM64T and Hyper-Threading Technology readyChipsetNorth Bridge: Intel 975X (support ATi CrossFire dual Gfx technology)South Bridge: Intel ICH7RPCIe Switch: IDT 89HA0324Front Side Bus1066/800 MHzMemory4 x DIMM, max. 8GB, DDR2 667/533, ECC and non-ECC un-buffered memoryDual channel architectureNative DDR2 800 SupportExpansion Slots4 x PCI-E x 16 slots2 x PCI 2.2StorageIntel ICH7R controller supports: - 4 x SATA 3.0Gb/s (RAID 0,1,10,5) - 1 x UltraDMA 133/100Marvell 88SE6145 supports:- 3 x SATA 3.0Gb/s (RAID 0,1,10)- 1 x eSATA 3.0Gb/sAudioADI 1988B 8-channel High Definition Audio CODECSupport Jack-Sensing, Enumeration, Multi-streaming and Jack-RetaskingCoaxial, Optical S/PDIF out on back I/O portLANMarvell 88E8052 + 88E8001PCI-E Dual Gb LAN controllerSupport Teaming functionUSB8 x USB 2.0 ports Overclocking FeaturesASUS AI NOS™AI OverclockingAI Clock Skew ASUS PEG LinkHyper Path 3ASUS BIOS ProfileASUS C.P.R.ASUS AI BoosterAdjustable FSB/DDR2 ratio. Fixed PCI/PCIe frequencies.Precision Tweaker:- vDIMM: 12 step DRAM voltage control- vCore: Adjustable CPU voltage at 0.0125V increment- SFS (Stepless Frequency Selection): allowing FSB tuning from 100 MHz up to 550 MHz at 1MHz increment- PCIe x16 Frequency: allowing PCIe x16 frequency from 90MHz up to 150MHz at 1MHz incrementAdvanced Thermal Design8-Phase Power DesignStack Cool 2Q-Fan 2ASUS Heat-pipe thermal solutionASUS Unique FeaturesMulti-language BIOSSATA on the GoAI NapAI GearMy Logo 2Other ASUS Special FeaturesASUS AI NET2CrashFree BIOS 3EZ Flash 2Q-ConnectorASUS AI QuietTPM (Trusted Platform Module) 1.2 (optional)Back Panel I/O PortsParallelPS/2 KeyboardPS/2 MouseRJ45S/PDIF Out (Coaxial + Optical)4 x USBeSATAAudio I/OWLAN antenna jack (Optional)Internal I/O Connectors4 x USB8-pin ATX+12V power24-pin ATX Power connectorChassis intrusionCPU fan with PWM controlChassis fan1 with Q-fan controlChassis fan2 with Q-fan controlPWR fanIDE connectorFloppy disk drive connectorSerial ATA connectors CD audio inIEEE 1394a portFront panel audio connectorBIOS8Mb flash ROM, AMI BIOS, Green, PnP, DMI, Wfm2.0, ACPI v2.0a, SMBIOS v 2.3, EZ flash, CrashFree BIOS2Manageability WOL by PME, WOR by PME, PXE, AI NET, Chassis IntrusionSupport CDDriversBIOS flash utility under DOSAI BoosterASUS PC Probe IIRAID utilityAnti virus softwareAdobe Acrobat Reader ver 7.0Microsoft Direct X ver 9.0CAccessoriesUser's manualUltraDMA cableFDD cable2-port USB module2-port 1394a moduleI/O shieldSATA cableSATA power cableForm FactorATX Form Factor, 12"x 9.6"(30.5cm x 24.5cm)O/S CompatibilityWindows Vista/XP/2000