PCI Express Edgecard Connectors Molex PCI Express Edgecard Connectors offer a third-generation I/O architecture. PCI-SIG revised the PCI Express specifications from version 1.1 to version 2.0. This revision doubles the PCI Express interconnect bit rate from 2.5GT/s (gigatransfer per second) to 5GT/s per lane. PCI Express supports high-bandwidth applications and is also backward compatible with PCI Express 1.1 version products.