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.

Unlike its PCI predecessor, which used a shared bus, PCI Express is a switched architecture of up to 32 independent, serial lanes (x1-x32) that transfer in parallel. Each lane is full duplex (see ...

This is the maximum amount specified by the PCI Express standard ... through a single connector. PCIe x4 and x8 cards can draw up to 25W from the motherboard's slot, while x1 cards are limited ...