If so, the top slot likely runs at PCIe x16, meaning 16 data lanes, which is ideal for high-bandwidth add-ins like a graphics card. And if you have a second slot, it likely runs at PCIe x8.
maybe two x4 links out of an x8-wired x16 slot. Now, there’s an alternative, and it’s PCIe switches – these are hefty chips which present a PCIe device interface to your host, and multiple ...
The ability to bundle multiple lanes to provide less or more bandwidth to specific ports or devices has meant that there was no need for a specialized graphics card slot, using e.g. an x16 PCIe ...