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Shouldn't higher clock frequency result in greater speed?

logi-cat

logi-cat

logi-cat

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Running an Intel burntest with my 2500K clocked at 4.7GHz, which resulted in a speed of 126.2188 GFlops. When attempting 4.8GHz, the highest i saw was 122.600 GFlops. Any particular reason why? I'm a bit stumped.
 
Using superPI i get a lower time when calculating PI, but when i was using the custompc benchmark suite (which include decoding, video editing, etc....) i get a higher score with the 4.7GHz then the 4.8GHz.
 
when you say not stable what do you mean? Does it need more voltage or have i just hit the wall of performance. if i run 15 times with ibt it doesnt notice an error.
 
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