ASRock DDR3 2400 Intel - LGA 1155 Motherboards (Z77 EXTREME4-M) CPU: LGA1155; Supports 2nd/3rd Generation Intel Core i7/i5/i3 Processor; Supports Intel Turbo Boost 2.0 Technology; Supports Hyper-Threading Technology Chipset: Intel Z77 Memory: 4x DDR3-2800+(OC)/2400(OC)/2133(OC)/1866(OC)/1600/1333/1066 DIMM Sots, Non-ECC, Unbuffered, Dual Channel, Max Capacity up to 32GB Slots: 2x PCI-Express 3.0 x16 Slots (single at x16/x8 or dual at x8/x8), 1x PCI Express 2.0 x16 Slot (runs at x4), 1 x PCI Express 2.0 x1 Slot Slots: 2x PCI-Express 3.0 x16 Slots (single at x16/x8 or dual at x8/x8), 1x PCI Express 2.0 x16 Slot (runs at x4), 1 x PCI Express 2.0 x1 Slot