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Little increase in fps after 40% overclocking with Hd7950??

February 17, 2013 4:28:59 PM

here is my spec i5-2500k (not oc)
sapphire hd 7950 oc
OCZ ModXstream pro700W, MOBO is ECS P67H2-A3.

I oced my hd 7950 from 925/1250 @ 1.25 v to 1160/1600. when I run furmark and heaven benchmark, there is a only 2 fps increase. javascript: void(0);And it was almost no difference when I play battlefield 3. I don't know if I did something wrong with my overlocking. OC scanner shows no artifact. Could guys please guide me? Thank you very much, below is the picture of my normal clock bench mark and oced benchmark, respectively.