You'll see PCIe slots on the motherboard between x1 and x16, which dictates how many lanes are available per slot. The more lanes, the higher the bandwidth. We're currently on PCIe 5.0, and while you ...

Support 16GT 8GT 5GT 2.5GT data rate ; Compliant with PCI Express 4.0, 3.1, 2.1, 1.1 and PIPE 4.2 standards ; x1, x2, x4, x8, x16 lane configuration with bifurcation ; Multi-tap adaptive programmable ...