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Is this usual for 3570k's?

post #1 of 5
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Hey, guys. I've just overclocked my 3570K to 4.5 on 1.18v. IBT stable, no WHEA errors so far, running Prime95 overnight. However... even with this and temps not clearing 65, I can't get to 4.8, even with 1.3 volts... do these things have like a voltage plateau where every clock bump takes a huge amount of voltage, and if so, is it at a different point on every chip?? Thanks!!
post #2 of 5
To get 4.8 I have to have mine up around 1.46-.47 range. Which pushes the temps, with a "custom" loop 360rad with only the cpu in the loop up to mid 70's Celsius.
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post #3 of 5
that's perfectly normal. the vast majority of ivies/sandies can't do more than 4.6ghz on reasonable voltage.

That said, Ivy really loves extra voltage (whereas most CPUs seem to have a sweet spot, for better or worse). If you are below 1.5v and 95*c max temp, there's no reason not to bump the voltage up and go for a high overclock even if it's a ridiculous voltage for said overclock.

And 4.8@1.3 will never happen lol. No one has done 4.8@1.3 so don't feel bad about that. 4.8 on average takes about 1.4v, +/- for better or worse chips. I had an ivy that needed 4.6@1.42v, and that was actually my better chip (the bad one was 100mhz consistently, and 4.5ghz@1.33 was very unstable, it needed 4.4@1.3v and would probably do 4.5@1.4v.).

Every chip is different but ivy bridge likes more and more voltage. With more voltage you can do more frequency, just it's a lower frequency per voltage or higher voltage per frequency depending on the quality of the chip. You'd have to have a truly amazing ivy to do 4.8@1.3v. My current i7 is a great chip (not golden, but great) and does 4.8 at around 1.35-1.4v (i know 1.4v was stable, im sure it could do it on less, didn't bother to test less since I'm trying to get 5ghz stable).
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post #4 of 5
4.5@1.18 but failing 4.8 @1.3 is kinda normal - I'd expect you to have it by 1.35, but possibility you wouldnt. Hows 4.6, 4.7? You should see some sort of scaling between, with every 100mhz needing more voltage added on compared to the last one i think - at least at the higher end of overclocks.

If you want an example, my CPU does 4.4@1.13, 4.5@1.165 - 4.7ghz passes basic testing at 1.24 but probably need 1.25-1.27 for 24/7 stability, so that would put my chip at, probably, a touch over 1.3v for 4.8 even though it's slightly better
Edited by Cyro999 - 3/8/13 at 10:49pm
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post #5 of 5
I need 1.18v too for 4.5 but need 1.35v for 4.8, but I also need pll overvoltage enabled at 4.8 so I just leave it at 4.7 with 1.28v never touch 65c and don't have sleep issues because of needing pll overvoltage enabled.
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