Step 4: Most graphics cards need more power than the PCIe slot provides.
Step 4: Most graphics cards need more power than the PCIe slot provides. If your card needs extra juice, you’ll see one, two, or even three PCIe power connectors on the card’s side facing away from the motherboard or, in some cases, on the top of the card. This can be a traditional six- or eight-pin PCIe power connector or a new mini 12- or 16-pin design for new Nvidia GPUs.