CPU Type: Dual Intel Xeon 5500 Series QPI: Up to 4.8/ 5.86/ 6.4GT/s South Bridge: Intel ICH10R Number of DDR3 Slots: 8 x 240pin Maximum Memory Supported: 64GB Channel Supported: Triple Channel PCI Express 2.0 x16: 4 PCI Express x8: 1 x PCI-E Gen.2 x8 slot (w/ x4 link)