PEX8-SX-SW is a PCI EXPRESS X8 reverse lane extender. The connector is mounted on top of the riser. The transmit and receive differential pairs of lane 0-7 are reverse routed to lane 7-0. The signal direction (TX, RX) and polarity are not reversed. The overall dimension of the riser is 2.98"(75.75mm) L x 1.96"(49.75mm) H