ASUS P9X79 WS LGA 2011 Intel X79 SATA 6Gb/s USB 3.0 SSI CEB Intel Motherboard 4-Way GeoForce SLI/Quad CrossFireX on Demand ASUS SSD Caching - One-click away from experiencing the benefits of both SSD and HDD without any capacity limitation USB BIOS Flashback - Plug in USB with BIOS file and just click the button for simplest BIOS update Dual Intel Gigabit LAN DIGI+ Power Control - Flexible precise adjustments for System Stability, High Power Efficiency and Improved Performance Scaling on both CPU & RAM 2 x PCIe 2.0 x16 (@x16 or x8)2 x PCIe 2.0 x16 (@x8)2 x PCIe 2.0 x16 (@x4) 8 x DIMM, max. 64Gb, DDR3 2400(O.C.)/1600/1333/1066 with ECC/non-ECC. non-buffer DIMM3