According to (I have misplaced a much better Nvidia GPU reference, if you know it please post a link) the GTX 460 768MB uses about 3 times the power of a GTX 750 but should almost equal its performance. Bandwidth and fill rates are about the same but shader performance is a little slower. Isn't technology great, three times less power and the same performance of a card from only 4 years ago. Hp Compaq D290 Mt Audio Drivers. Remember the GTX 750 is by no means a high-end card but it's about what I want in terms of power. Hp Officejet 6200 Series Windows 8.
Of course if you really need some GPU performance but still want efficiency then take a look at a GTX 980, that thing is awesome. Only draws 165 Watts while doing 4612 GFLOPS. But too expensive for me.