I'm wondering, for a video card like the HD 4870 that requires two 6-pin connectors, does it card draw power from one of the connectors primarily and then when it needs more it draws from the other or is it simultaneous?
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I believe it uses both at the same time.
yep, uses both. the reason there are 2 connectors is so it doesnt draw too much power through 1 pcie cable and burn out the cable or melt the insulation.
It uses both at the same time i will not function without them both