CPU AMD Socket AM3 ;Phenom™II /Athlon™II /Sempron™ 100 Series Processors  AMD 140W CPU Support AMD Cool 'n' Quiet™ 2.0 Technology (by CPU type)  Support 45nm CPU  *Refer to www.asus.com for the AMD CPU support list Chipset AMD 770/SB710  System Bus Up to 5200 MT/s ; HyperTransport™ 3.0 interface Memory 4 x DIMM, Max. 16 GB, DDR3 1800(O.C.)/1600(O.C.)/1333(O.C.)/1066 ECC,Non-ECC,Un-buffered Memory Dual Channel memory architecture *Due to OS limitation, when installing total memory of 4GB capacity or more, Windows® 32-bit operation system may only recognize less than 3GB. Install a 64-bit WindowsWindows® OS when you want to install 4GB or more memory on the motherboard. Please refer to www.asus.com or user manual for Memory QVL. Expansion Slots 1 x PCIe 2.0 x16  2 x PCIe x1  3 x PCI Storage SB710 Chipset  1 xUltraDMA 133/100  6 xSATA 3 Gb/s ports Support RAID 0,1,10,JBOD  LAN RTL8112L PCIe Gigabit LAN controller featuring AI NET2 Audio VT1708S High Definition Audio 8-Channel CODEC  - Supports Jack-detect and Multistreaming teconologies, and Front Panel Jack-Retasking  - Optical S/PDIF Out ports at back I/O USB 12 USB 2.0/1.1 ports (6 ports at mid-board, 6 ports at back panel) ASUS Unique Features - ASUS EPU-4 Engine  - ASUS Express Gate  - ASUS Turbo Key  - ASUS Q-Fan  - ASUS CrashFree BIOS 3  - ASUS EZ Flash 2  - ASUS MyLogo 2  - ASUS AI NET 2  Overclocking Features Intelligent overclocking tools - ASUS Turbo Key SFS (Stepless Frequency Selection) - FSB tuning from 200 MHz up to 550MHz at 1MHz increment  - PCI Express frequency tuning from 100MHz up to 150MHz at 1MHz increment  Overclocking Protection - ASUS C.P.R.(CPU Parameter Recall) Back Panel I/O Ports 1 x PS/2 Keyboard/Mouse Combo port  1 x S/PDIF Out (Optical)  1 x LAN(RJ45) port  1 x COM port  1 x LPT  6 x USB 2.0/1.1  8-channel Audio port Internal I/O Connectors 3 x USB connectors supports additional 6 USB 2.0 ports  1 x IDE connector  6 x SATA connectors  1 x S/PDIF Out connector  1 x CPU / 1 x Chassis Fan connectors  1 x System Panel connector  1 x High Definition Front panel audio connector  1 x 24-pin EATX power connector  1 x 4-pin ATX 12V Power connector  BIOS 8 Mb Flash ROM AMI BIOS, PnP, DMI v2.0, WfM2.0, ACPI v2.0a, SMBIOS 2.5  Accessories User's manual 1 x I/O Shield  1 x UltraDMA 133/100/66 cable  2 x SATA cable(s)  Support Disc Drivers ASUS PC Probe II  Express Gate Anti-virus software (OEM version) ASUS Update Form Factor ATX Form Factor  12 inch x 8.4 inch ( 30.5 cm x 21.3 cm )