Early GPUs used Peripheral Component Interconnect (PCI) interface to communicate with the motherboard of a computer, a type of slot which is still used today for simple motherboard add-ons such as extra audio-processing cards or USB ports. As graphics cards became more powerful and graphics applications more demanding, a faster kind of interface called Advanced Graphics Port (AGP) was created and then PCIe x16 (PCI Express 16-lane) after it, the current overall standard. In 2008 PCIe 2.0 was introduced, doubling the speed of PCIe 1.0 and still working with older PCI Express interfaces.