Upgraded cpu but cant play the same game i used to play.?

Hey guys i had an amd radeon hd 6790 and because it broke down i bought a gtx 750 1gb i know both cards are pretty weak by today standards but in the comparison charts the gtx 750 seems to be stronger in every aspect.that beeing said when i had the 6790 i could play assassins creed unity at around 20-25 fps but now... show more Hey guys i had an amd radeon hd 6790 and because it broke down i bought a gtx 750 1gb i know both cards are pretty weak by today standards but in the comparison charts the gtx 750 seems to be stronger in every aspect.that beeing said when i had the 6790 i could play assassins creed unity at around 20-25 fps but now i can barely get 5fps.how does this make any sense? why i cant play it anymore?
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