Is a 2 Molex LP4 to 6 pin PSU connector adapter good?

Dodoegg

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Aug 19, 2014
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I plan to buy a VtX3D R7 265 graphics card, but my 650W PSU is inferior and so lacks a 6 pin connector. Therefore, if I wish to use this graphics card, I will require a 6 pin connector. I have two female Molex LP4 connectors free, so I could use an adapter, but the graphics card is 500W, and some power may be lost through the adapter, will this be a problem?