PCIexpress



Normal PCIe connectors are finger/knife connectors.
The PCIe card has copper fingers on the card edge and get inserted into the PC board connector.

Manufacturers of PCIexpress Connectors
AVX {1x, 4x, 8x, 16x PCI Express Card Edge Connector, 36 Way, 64 Way, 96 Way, 164 Way Connectors, 164-pin w/Latch}
FCI {1x, 4x, 8x, 16x PCI Express* Straddle-Mount Card Edge Connector, Vertical-mount PCIe connector}
Meritec {Right Angle X1, X4, X8 and X16 PCI Express Connectors}
Samtec Inc. {PCI Express Socket; 36, 64, 98 and 164 Positions, Through Hole / Edge Mount. RoHs Compliant}
Tyco Electronics {PCI Express Connectors for x1, x4, x8, and x16 lanes}

Note; the size (length) of the connector changes based on the number of required lanes. The longest connect size results from using the 16x interface bus.