Chipset AMD 990FX/SB950Memory4 x DIMM Max. 32GB DDR3 1866/1600/1333/1066 Hz ECC Non-ECC Un-buffered MemoryDual Channel Memory Architecture* Refer to www.asus.com or user manual for the Memory QVL (Qualified Vendors Lists).* 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 Windows OS when you want to install 4GB or more memory on the motherboard.* Due to CPU spec. AMD 100 series CPUs support up to DDR3 1066MHz. With ASUS design this motherboard can support up to DDR3 1333MHz.Multi-GPU SupportSupports NVIDIA Quad-GPU SLI TechnologySupports AMD Quad-GPU CrossFireX TechnologyExpansion Slots3 x PCIe 2.0 x16 (dual x16 or x16 x8 x8) *11 x PCIe 2.0 x16 (x4 mode black)1 x PCIe 2.0 x11 x PCIStorageAMD SB950 controller :6 x SATA 6Gb/s port(s) brownSupport Raid 0 1 5 10JMicron JMB362 controller :2 x SATA 3Gb/s port(s) black1 x Power eSATA 3Gb/s port(s) green1 x eSATA 3Gb/s port(s) redLANRealtek 8111E 1 x Gigabit LAN Controller(s)AudioRealtek ALC 892 8-Channel High Definition Audio CODEC- Supports : Jack-detection Multi-streaming Front Panel Jack-retaskingAudio Feature :- Absolute Pitch 192kHz/ 24-bit True BD Lossless Sound- Blu-ray audio layer Content Protection- ASUS Noise Filter- Optical S/PDIF out port(s) at back panelIEEE 1394VIA 6308P controller2 x IEEE 1394a port(s)(1 at mid-board 1 at back panel)USB PortsASMedia USB 3.0 controller :4 x USB 3.0 port(s) (2 at back panel blue 2 at mid-board)AMD SB950 controller :14 x USB 2.0 port(s) (10 at back panel black+red 4 at mid-board)Special FeaturesASUS Dual Intelligent Processors 2 with DIGI+ VRM :TUF ENGINE! Power Design :- 8 +2 Digital Phase Power Design- TUF Components (Alloy choke Cap. & MOSFET; certified by military-standard)- ASUS DIGI+ VRM Utility- E.S.P. : Efficient Switching Power DesignUltimate COOL! Thermal Solution :- TUF CeraM!X Heatsink Coating Tech.- TUF Thermal RadarASUS Exclusive Features- MemOK!- AI Suite II- Anti-Surge- ESD Guards- Front Panel USB 3.0 Support- ASUS UEFI BIOS EZ Mode featuring friendly graphics user interfaceASUS EZ DIY :- ASUS Q-Shield- ASUS O.C. Profile- 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-DIMM- ASUS Q-ConnectorBack I/O Ports1 x PS/2 keyboard/mouse combo port(s)1 x eSATA 3Gb/s1 x Power eSATA 3Gb/s1 x IEEE 1394a1 x LAN (RJ45) port(s)2 x USB 3.010 x USB 2.01 x Optical S/PDIF out6 x Audio jack(s)Internal I/O Ports1 x USB 3.0 connector(s) support(s) additional 2 USB 3.0 port(s) (19-pin moss green)2 x USB 2.0 connector(s) support(s) additional 4 USB 2.0 port(s)1 x COM port(s) connector(s)6 x SATA 6Gb/s connector(s)2 x SATA 3Gb/s connector(s)1 x IEEE 1394a connector(s)1 x CPU Fan connector(s) (4 -pin)4 x Chassis Fan connector(s) (3 x 4 -pin 1 x 3 -pin)1 x Optional Fan connector(s) (4 -pin)1 x S/PDIF out header(s)1 x 24-pin EATX Power connector(s)1 x 8-pin ATX 12V Power connector(s)1 x Front panel audio connector(s) (AAFP)1 x System panel(s) (Q-Connector)1 x MemOK! button(s)1 x Clear CMOS jumper(s)