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PCI Express Edgecard Connectors Molex PCI Express Edgecard Connectors are a third generation I/O architecture. PCI-SIG recently 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 provides support to high-bandwidth applications and is also backward compatible with current PCI Express 1.1 version products.