Video cards need a way of talking to other parts of the computer much like all expansion cards. The video card plugs into a slot on the motherboard and there speed is based on the bus connector being used. The fastest type of bus type incorporated into motherboard designs is the PCI Express (PCIe). This bus type is based around serial links called lanes. The PCIe 1.1 specification supports x1 (pronounced "by one"), x2, x4, x8, x16, and x32 lanes. In each lane, the most common version PCIe 1.1 carries 250 MB/s in each direction. Every lane of the PCIe is a full duplex link; capable of simultaneous transmit and receive. The PCIe 1.1 bus runs at 2.5 GHz. An explicit clock is not used; instead the data stream is encoded using the 8b/10b scheme, which ensures that there are sufficient transitions within a single 10 bit character to properly and reliably recover the clock.