The first generation of PCIe, version 1.0, was released in 2004. It offered a significant increase in bandwidth compared to the traditional PCI interface, with a data transfer rate of 2.5 GT/s (gigatransfers per second). PCIe 1.0 supported a single lane (x1) with a bandwidth of 250 MB/s (megabytes per second).
Each PCIe revision has introduced significant features and enhancements, including: pci express revision