can psu decrease gpu performance

Samlance

Honorable
Jan 7, 2014
43
0
10,530
i had a R7260x which crashed and i then got r9270x and im using them with the same PSU that is quite low end, it is a 500W, but not a good one, which is why i have ordered a zalman 600W, but my r9270 at the moment does not seem to be as good in gaming as my 7260?? is it a bad card or is my psu just decreasing the performance, please help.