The PCIex16 slot on mainboards is specified to supply a maximum Wattage of 75W, so lower end Graphics cards don't need additional power connectors.
What about Graphics Cards that do have one or multiple 6- or 8-pin connectors? Do they still use the power from the slot, or do they rely solely on the power that is supplied directly by the PSU?
The specific card in question is the nVidia GTX 970, which - in the reference design - is specified to have a TDP of 150W, and two 6-pin connectors, which can supply 75W each, so that would be enough for the card.
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