The GTX 660 just takes one supplementary 6-pin PCIe power connector that needs to be plugged into the video card. Your power supply has two of these, but you need to use just one. It provides the additional power that is needed.
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The GTX 660 just takes one supplementary 6-pin PCIe power connector that needs to be plugged into the video card. Your power supply has two of these, but you need to use just one. It provides the additional power that is needed.