When attached to a motherboard's PCIe x16 slot, a card such as the GeForce RTX 4080 can draw up to 75W from the +3.3V and +12V rails (3.3V x 3A + 12V x 5.5A). This is the maximum amount specified ...
If you ever looked at a PCI to PCIe x16 adapter and wondered what’d happen ... to supply external power with even a low-end GT 1030 card – as the PCI slot cannot provide enough power ...
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 ...