how many pcie slots do i have | how many pcie slots do i have

Knowing how many PCIe lanes you have is essential to add a new component to any PCIe slots. Installing devices that occupy more PCIe lanes than available can underutilize, undercut, or worse still, render the installed components inoperable.

Here I discuss in detail how to add more PCIe slots. However, it should be noted that the splitters DO NOT increase the bandwidth or the amount of PCIe lanes

Also see: many PCIe slots of what type are provided by the "2019" Mac Pro? How do you upgrade or replace a PCIe card in the "2019" Mac Pro?