There's only two reasons that performance will drop as overclock goes up. Either you pushed your card past a temperature threshold (70C and 80C) that made it throttle itself down or your overclock is unstable. Easiest way to check which it is is to check your max temperature after an entire bench run and if it's over 70C then increase your fan speed just enough so it never goes over 70C and then rerun it. If performance goes up after that, then you know it was the temperature causing issues. If stayed the same, then your overclock is unstable. Usually only unstable memory overclock will actually reduce performance. An unstable core overclock usually will just BSOD, crash your display driver, or cause artifacting.
post #381 of 1562
5/30/12 at 4:47pm