“These connectors comply with the latest PCIe CEM 5.0/6.0 specifications and support devices ... The two halves lock together with a thumb-releasable latch. To give an idea of size, power pin pitch is ...
PCI Express x1 edge connector drawing with pin numbers. The basic board design for a PCIe PCB is highly reminiscent of that of PCI cards. Both use an edge connector with a similar layout.