Power supplies, PCIe slots, and GPU power cables
A new graphics card draws most of its power from the PSU via dedicated PCIe power connectors—not from the motherboard slot alone. High-end GPUs can have brief transient spikes above their average power; a PSU that is only “technically” enough on paper may trip protections or cause instability under load.
Common connectors
Many cards use 6+2 pin PCIe (“8-pin”) connectors. Newer high-end GPUs may use 12VHPWR (12+4 pin) adapters or native cables—use only the cables intended for your PSU model, avoid sketchy adapters, and follow the card manufacturer’s manual.
What to do before you buy
Check the card’s TGP and recommended PSU wattage, then add margin if you run many drives, heavy CPU overclocks, or live in a hot climate. If your PSU is old or of unknown quality, upgrading it with the GPU is often the safe choice.
PCIe slot length and case clearance
Long triple-fan cards can block adjacent slots or conflict with case depth. Verify GPU length and thickness (slot count) against your case manual—RankedGPU listings capture cooler style hints but not every mechanical constraint.
Next: install a graphics card.