If you have a power-hungry card, you'll need to plug an auxiliary power source into the board, usually one or two 4-pin hard drive power connectors or a 6-pin PCI Express power connector. Video card manufacturers will often package a power splitter or a dual 4-pin to 6-pin adapter with the card in case your system doesn't have enough free power connectors, but you can order the cables online for less than $5 in case you get a bare-bones card bundle.

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