CPUIntel Socket 1156 Core i7 Processor/Core i5 Processor/Core i3 Processor Supports Intel Turbo Boost TechnologyChipsetIntel P55 Express ChipsetMemory4 x DIMM, Max. 16 GB, DDR3 2200(O.C.)*/1600/1333/1066 Non-ECC,Un-buffered MemoryDual Channel memory architectureSupports Intel Extreme Memory Profile (XMP)*Hyper DIMM support is subject to the physical characteristics of individual CPUs. Some hyper DIMMs only support one DIMM per channel. Expansion Slots2 x PCIe 2.0 x16 (single at x16 or dual at x8 / x8 mode)3 x PCIe 2.0 x1 (2 at 5GT/s [blue]; 1 at 2.5GT/s [gray])2 x PCIMulti-GPU SupportSupports NVIDIA Quad-GPU SLI TechnologySupports ATI Quad-GPU CrossFireX TechnologyStorageIntel P55 Express Chipset built-in6 xSATA 3.0 Gb/s portsIntel Matrix Storage Technology Support RAID 0,1,5,10JMicron JMB363 PATA and SATA controller1 xUltraDMA 133/100/66 for up to 2 PATA devices1 xExternal SATA 3Gb/s port1 xSATA 3Gb/s port (black)Marvell PCIe SATA6Gb/s controller:- 2 x SATA 6.0 Gb/s ports (Gray)LANRealtek 8112L Gigabit LAN controller featuring AI NET2AudioVIA VT1828S 8-Channel High Definition Audio CODEC- Absolute Pitch BD192/24- DTS Surround Sensation UltraPC- Supports Jack-Detection, Multi-streaming, Front Panel Jack-Retasking- Coaxial / Optical S/PDIF out ports at back I/OIEEE 1394VIA 6308P controller supports 2 x 1394a port(s) (one at mid-board; one at back panel)USBNEC USB 3.0 controller- 2 x USB 3.0 ports (Blue, at back panel)Intel P55 Express Chipset- 12 x USB 2.0 ports (6 ports at mid-board, 6 ports at back panel)ASUS Unique FeaturesUnique PCIe X4 Chip for Ultra Performance- True USB 3.0 Support- True SATA 6Gb/s SupportASUS Xtreme Design:ASUS Hybrid Processor - TurboV EVO- Auto Tuning, TurboV , CPU Level UP and Turbo KeyASUS 16 Hybrid Phase- T.Probe Technology for Active Cooling- 12+2 Phase Power Design* 16 Hybrid Phase = 12+2 Phase x T.ProbeASUS Hybrid OS - Express GateASUS Exclusive Features- MemOK!- ASUS EPUASUS Quiet Thermal Solution- ASUS Fanless Design: Stylish Heatsink- ASUS Fanless Design: Stack Cool 3- ASUS Fan XpertASUS Crystal Sound- ASUS Noise FilterASUS EZ DIY- ASUS Q-Shield- ASUS Q-Connector- ASUS O.C. Profile- ASUS CrashFree BIOS 3- ASUS EZ Flash 2- ASUS MyLogo 2- Multi-language BIOSASUS Q-Design- ASUS Q-LED (CPU, DRAM, VGA, Boot Device LED)- ASUS Q-Slot- ASUS Q-DIMMOverclocking FeaturesPrecision Tweaker 2- vCore: Adjustable CPU voltage at 0.00625V increment- vIMC: Adjustable IMC voltage at 0.00625V increment- vDRAM Bus: 104-step DRAM voltage control- vPCH: 36-step chipset voltage control- vCPU_PLL: 56-step reference voltage controlSFS (Stepless Frequency Selection)- PCI Express frequency tuning from 100MHz up to 200MHz at 1MHz increment- Internal Base Clock tuning from 80MHz up to 500MHz at 1MHz incrementOverclocking Protection- ASUS C.P.R.(CPU Parameter Recall)Back Panel I/O Ports1 x PS/2 Keyboard (Purple)1 x PS/2 mouse port (Green)1 x Coaxial S/PDIF Output1 x Optical S/PDIF Output1 x IEEE1394a1 x eSATA port1 x RJ45 port2 x USB 3.0/2.0 ports (blue)6 x USB 2.0/1.1 ports8-channel Audio I/OInternal I/O Connectors3 x USB connectors support additional 6 USB ports1 x IDE connector1 x IEEE 1394a connector1 x CPU Fan connector1 x Power Fan connector7 x SATA 3.0Gb/s connectors (blue/black)2 x SATA 6.0Gb/s connectors (gray)2 x Chassis Fan connector (1x4-pin, 1x3-pin)Front panel audio connector1 x S/PDIF Out Header24-pin ATX Power connector1 x 8-pin ATX 12V Power connectorSystem Panel(Q-Connector)1 x MemOK! buttonBIOS16 Mb Flash ROM , AMI BIOS, PnP, DMI2.0, WfM2.0, SM BIOS 2.5, ACPI 2.0a, Multi-language BIOS, ASUS EZ Flash 2, ASUS CrashFree BIOS 3ManageabilityWfM 2.0,DMI 2.0,WOL by PME,WOR by PME,PXEAccessoriesUsers manual1 x UltraDMA 133/100/66 cable2 in 1 Q-connector2 x Serial ATA 3.0Gb/s cables2 x Serial ATA 6.0Gb/s cables1 x 2-port USB and eSATA module1 x SLI BridgeASUS Q-ShieldSupport DiscDriversAnti-virus software (OEM version)ASUS UpdateASUS UtilitiesForm FactorATX Form Factor12 inch x 9.6 inch ( 30.5 cm x 24.4 cm ) It is highly recommended to always use the most recent driver version available.Do not forget to check with our site as often as possible in order to stay updated on the latest drivers, software and games.Try to set a system restore point before installing a device driver. This will help if you installed a wrong driver. Problems can arise when your hardware device is too old or not supported any longer.