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post #19561 of 22164
Quote:
Originally Posted by kristoferen View Post

Is there a way to (roughly) calculate how much additional core voltage is required to hit 100mhz higher than current?

Is there any vcore voltage that will damage the motherboard or other (non-CPU) components?

jpmboy likes to say expect to spend abut ~10mv per core, so about 60mv per 100Mhz for a hexacore, that's until you run into the voltage wall where it starts taking exponentially more voltage
Edited by michael-ocn - 7/4/16 at 11:19am
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post #19562 of 22164
Quote:
Originally Posted by michael-ocn View Post

Nice, that's a very fast oc at not too high voltage!

But fyi about prime 26.6. Its not very useful as a stress testing program for haswell-e since it pre-dates the avx instructions. Those newer instructions are what makes it hard to stabilize a haswell-e oc. To really test it out, you need to run somethings that uses those instructions in moderation too: aida(cpu+fpu+cache), the x265 and x264 benches, realbench, or occt.

With Aida (cpu+fpu+cache), it's stable at 4.85GHz/1.325v (6 hours). Real bench with 1.335v. Will give a try with OOCT though!

Thakns for the tips!
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post #19563 of 22164
Quote:
Originally Posted by michael-ocn View Post

jpmboy likes to say expect to spend abut ~10mv per core, so about 60mv per 100Mhz for a hexacore, that's until you run into the voltage wall
Quote:
Originally Posted by skmanu View Post

1- no. Example: I need 1.295v for 4.8GHz, 1.338v for 4.85GHz, 1.41v for 4.9GHz... Could have been 1.295 for 4.8GHz, 1.41 for 4.85GHz, or nothing, the wall..
2- no, you'll fry your CPU before frying the board.

Thank you.

I need 1.286v to be 100% stable at 4.6GHz on all six cores (5820k). I did brief testing at 4.9GHz @ 1.35v (5 minute RealBench + one run of Intel XTU Bench, but probably isn't long term stable; 1.3v crashed within minutes of booting Windows). I didn't dare go up higher on voltage because while the CPU is replaceable, the mobo is less so. If I should expect ~60mV increase per 100MHz, should I bother giving closer to 1.41v a shot at 5.0GHz?
post #19564 of 22164
Quote:
Originally Posted by kristoferen View Post


Thank you.

I need 1.286v to be 100% stable at 4.6GHz on all six cores (5820k). I did brief testing at 4.9GHz @ 1.35v (5 minute RealBench + one run of Intel XTU Bench, but probably isn't long term stable; 1.3v crashed within minutes of booting Windows). I didn't dare go up higher on voltage because while the CPU is replaceable, the mobo is less so. If I should expect ~60mV increase per 100MHz, should I bother giving closer to 1.41v a shot at 5.0GHz?

Well, the CPU is replaceable, but good luck find another one doing 5min realbench at4.9GHz/1.35v wink.gif Don't fry it!
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post #19565 of 22164
Quote:
Originally Posted by kristoferen View Post


Thank you.

I need 1.286v to be 100% stable at 4.6GHz on all six cores (5820k). I did brief testing at 4.9GHz @ 1.35v (5 minute RealBench + one run of Intel XTU Bench, but probably isn't long term stable; 1.3v crashed within minutes of booting Windows). I didn't dare go up higher on voltage because while the CPU is replaceable, the mobo is less so. If I should expect ~60mV increase per 100MHz, should I bother giving closer to 1.41v a shot at 5.0GHz?

nice, what kind of cooling have you got!

1.4v is too high for my tastes, probably 1.35 is too much for me too, but that's just me, ymmv, it's not at all an option for me to run with that much voltage due to temps
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post #19566 of 22164
Quote:
Originally Posted by michael-ocn View Post

nice, what kind of cooling have you got!

1.4v is too high for my tastes, probably 1.35 is too much for me too, but that's just me, ymmv, it's not at all an option for me to run with that much voltage due to temps

Same as yours wink.gif

H240X, with an extra 280 and an extra 140 rads.
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post #19567 of 22164
Quote:
Originally Posted by michael-ocn View Post

nice, what kind of cooling have you got!

1.4v is too high for my tastes, probably 1.35 is too much for me too, but that's just me, ymmv, it's not at all an option for me to run with that much voltage due to temps

Same as yours wink.gif

H240X, with an extra 280 and an extra 140 rads.

Edit: I lowered to 4.8GHz/1.295v (could say 1.3, but like the "below 1.3v", lol!).
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post #19568 of 22164
Quote:
Originally Posted by michael-ocn View Post

nice, what kind of cooling have you got!

1.4v is too high for my tastes, probably 1.35 is too much for me too, but that's just me, ymmv, it's not at all an option for me to run with that much voltage due to temps

Corsair H115i. Temps get a little warm during stress unless I ramp up the fans to quite loud levels, but real world usage rarely makes them spin up beyond reasonable noise levels.

I don't know that I'd want to run that much voltage 24/7, and 4.6GHz vs 4.9/5.0 really wouldn't make a big difference to me 99% of the time anyway, but it'd be nice to hit that magical 5.0 just to say I did it tongue.gif
post #19569 of 22164
Quote:
Originally Posted by skmanu View Post

Same as yours wink.gif

H240X, with an extra 280 and an extra 140 rads.

Edit: I lowered to 4.8GHz/1.295v (could say 1.3, but like the "below 1.3v", lol!).

sounds like lots of extras smile.gif

fyi, occt is tougher to pass than those others, some people don't bother with getting that one to work, they look at it kindof like p95 w/avx but its not really excessive like that. occt large data set is the one you want to use (if you want to use it).
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post #19570 of 22164
Quote:
Originally Posted by kristoferen View Post

Corsair H115i. Temps get a little warm during stress unless I ramp up the fans to quite loud levels, but real world usage rarely makes them spin up beyond reasonable noise levels.

I don't know that I'd want to run that much voltage 24/7, and 4.6GHz vs 4.9/5.0 really wouldn't make a big difference to me 99% of the time anyway, but it'd be nice to hit that magical 5.0 just to say I did it tongue.gif

whoa, i'm surprised a basic clc can handle that! either you've got a really cool running chip or a very high tolerance for high temps?

edit:
> I need 1.286v to be 100% stable at 4.6GHz
ah... that sounds reasonable
Edited by michael-ocn - 7/4/16 at 12:22pm
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