I have a sapphire radeon hd 6790. Im looking at a possible upgrade to a palit gtx 750ti stormx oc for the main reason being to conserve power because my bills are killing me. My question is: In terms of gaming, does the 750ti outperform or at least be on par with the 6790? I dont want to downgrade the performance but I do want to save more power. Thanks for your inputs.