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overclocking too much, a bad thing?

post #1 of 9
Thread Starter 
in a quick cinebench cpu run, at 4.9ghz i got a cpu score of 7.6x. but after clocking to 5.1ghz i got a score of 5.6x. i upped the vcore to the max safe, from what ive read, of about 1.52v. it was stable enough to boot windows, not crash in prime and complete the cinebench run, but the score was horrible.

is it just that 4.9 is the sweet spot with my cpu and going to 5.1 is like redlining a car and power is just dropping off?
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post #2 of 9
is it stable at 5.1? you get worse performance from unstable oc
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post #3 of 9
Yeah, its more then likely not stable if the result is lower. You've updated your bios i assume?
post #4 of 9
Don't forget, not all SB's will be able to hit extreme's like that. If yours is one of the (statistical) 10% of i5-2500K's that can go past the 5.0 mark, then congrats! But they just aren't all stable at those speeds.
     
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post #5 of 9
Thread Starter 
i guess its just not stable at that high of a clock. i tried again for 5ghz, and its running fine. got my highest score yet in CB11.5 of 7.70, with these settings.

http://valid.canardpc.com/show_oc.php?id=1790052
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post #6 of 9
its degrading..somehow..seems you overworked that SB chip and now its just gonna go lifeless..what a hype..all of that hype now getting killed softly..
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post #7 of 9
I saw your other thread which showed you were hitting 84C in Prime95 after only 13 minutes. I believe that test was at 4.9Ghz with 1.472. I can only imagine you'd need 1.5v+ to be able to run benchmarks at 5.1 GHz. This says to me that your temps are up into the 90s, which is not only dangerous, but will also cause the CPU to begin thermal throttling. You need much better cooling if you're going to continue to run around 5 GHz.
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post #8 of 9
Thread Starter 
Quote:
Originally Posted by Speedboat_LS View Post
I saw your other thread which showed you were hitting 84C in Prime95 after only 13 minutes. I believe that test was at 4.9Ghz with 1.472. I can only imagine you'd need 1.5v+ to be able to run benchmarks at 5.1 GHz. This says to me that your temps are up into the 90s, which is not only dangerous, but will also cause the CPU to begin thermal throttling. You need much better cooling if you're going to continue to run around 5 GHz.
im not sure how much the temps will increase over a larger amount of time. but they seemed to have peaked by that point. they kept bouncing between 82-84c, never went any higher, so i just stopped the test. im too impatient for a 12/24hr run.


and it cools fine for what i do. after a couple hours of bc2, i had only peaked in the 50's.
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post #9 of 9
Quote:
Originally Posted by stRodda View Post
im not sure how much the temps will increase over a larger amount of time. but they seemed to have peaked by that point. they kept bouncing between 82-84c, never went any higher, so i just stopped the test. im too impatient for a 12/24hr run.


and it cools fine for what i do. after a couple hours of bc2, i had only peaked in the 50's.
His point is that if your chip thermally throttles itself then it's going to drop the clock speed, and your CB scores are going to suffer. And high clocks + high volts + high stress = high temps, so that's likely the problem.

For example @ 5.2GHz I require about 1.575V to run stable, but my H50 can't pull that much heat away, so I can get a 10.xx CB score if I run at night from total idle temps and it manages to finish the CB run before my chip overheats and throttles, but if I don't start from cold enough state or the chip heats up a little faster it drops the score to 8 or 9.
Edited by ocpokey - 4/27/11 at 3:22pm
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