CPU Intel® Socket 1156 Core™ i7 Processor/Core™ i5 Processor Supports Intel® Turbo Boost Technology Chipset Intel® P55 Express Chipset Memory 4 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. Please refer to Memory QVL for details. *Refer to www.asus.com or this user manual for the Memory QVL (Qualified Vendors Lists). Expansion Slots 1 x PCIe 2.0 x16 (single at x16) 1 x PCI Express 2.0 x16 slot (at x4 mode, 2.5GT/s) 2 x PCI Express 2.0 x1 slots (2.5GT/s) 3 x PCI Multi-GPU Support Supports ATI® Quad-GPU CrossFireX™ Technology Storage Intel® P55 Express Chipset built-in 6 xSATA 3.0 Gb/s ports Intel Matrix Storage Technology Support RAID 0,1,5,10 VIA VT6415 PATA controller - 1 x UltraDMA 133/100/66 for up to