I just bought a new video card and it requires a power supply and i have the cables but im lost on where to put them.
you take the power from your power supply to give to the video card. older cards use the 4-pin moly connectors and the new ones use either 6-pin or 8-pin PCI-e, If you don't have the right connectors from the PSU then you can buy an adapter for about $4 at most computer stores
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Connect it to your power supply.
You use an open power plug from the power supply. If there isn't an extra one, you need a splitter.