ASRock LGA1155/Intel Z75/DDR3/Quad CrossFireX /CrossFireX/SATA3/USB3.0/A/GBE/ATX Motherboard Z75 PRO3 CPU: LGA1155; Supports Intel 2nd/3rd Generation Core i7/i5/i3 Processors; Supports Intel Turbo Boost 2.0 Technology; Supports Hyper-Threading Technology Chipset: Intel Z75 Memory: 4x DDR3 2800+(OC)/2400(OC)/2133(OC)/1866(OC)/1600/1333/1066 DIMM Slots, Non-ECC, Unbuffered, Dual Channel, Max Capacity up to 32 GB Slots: 1x PCI-Express 3.0 x16 Slot; 1x PCI-Express 2.0 x16 Slot (runs at x4); 1x PCI-Express 2.0 x1 Slot; 2 x PCI Slots Multi-Graphics: Supports AMD Quad CrossFireX and CrossFireX