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 ...

There are different size slots depending on the device, ranging from x1, x4, x8, x16, and x32, depending on what needs to be installed into the system. Unlike PCIe ... staggering 1.79 TB/sec ...

one can still use the USB-C ‘power input’ on the SBC as a host controller. This way one can have both PCIe x1 and USB on a Raspberry Pi 4.