Some smaller PCIe slots run at x1 or x4, and these are meant for low-bandwidth ... even when plugged into x16 slots. Only a few select workstation or high-end models can do more.
Typically, graphics cards use PCI Express x16 slots. That's a PCIe slot configured ... many GPUs in the past have used x8 or even x4 connections. This limits the bandwidth available between ...
While older computers and storage drives might still use the common SATA or the older PCIe 3.0 interfaces to sling your bits of data around, more recent computing equipment most often offers the ...