The 5000 Series MCH used on these boards provides PCIe support compliant with the PCI Express Interface Specification version 1.0a. The raw bit-rate per bit lane is 2.5 Gb/s. This results in a real bandwidth per bit lane of 250 MB/s (given the 8/10 encoding used to transmit data across this interface). A PCIe port provides four bidirectional bit lanes and is referred to as a x4 port. The maximum theoretical realized bandwidth for a x4 PCIe port is 1 GB/s in each direction.