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Results of droping 30+ degrees for oc were not as expected

post #1 of 8
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Hello I have a gigabyte 670 windforce card running an overclock of +180mhz and the temperature is 61c on full load, so i attemped a high overclock by blowing outside winter air directely at the gpu with a powerful fan droping my temperature to 19c UNDER FULL LOAD. but my clocks did not even budge, i saw an increase of +10mhz. It would crash if i tried to get an extra +20, additionally voltage on this card is locked at 1.175v. Is increasing the voltage the only way to get higher clock speeds and does temperature just not matter with clockspeeds and is only good to give more mV?

Edit: So my drop of 40c is worthless without unlocking volts?
Edited by Dragon69er - 1/24/16 at 1:00am
post #2 of 8
What iv found is temp doesnt play much of a big role in the 0-60C range. You wont see much if any higher clock speeds. If you had been going from a high temp like 80-90c you would of picked up a little bit more. Or if you were going to subzero temps youd see a little more. But neither of those will be as much as the gains youd see from adding voltage.
post #3 of 8
I took my i7 6700k out of my phase change rig en went to watercooling and lost 400Mhz. Alot more then I expected. It was rock stable at 5Ghz and now it's running at 4.6. So temperature comes into play but probably not in the range you are working in. And remember not all chips are equal.
DEScheep
post #4 of 8
I put a TEC under my waterblock on my CPU, it didn't drop my temps that much (the temperature of the coldplate/IHS varies between -13*c to about 10*c, but my actual core temps still reach 50-60*c under stress testing), but it allowed me to get from 4.8ghz to 5.1ghz and am pretty stable, also decreased the voltage required, I can actually boot 5.1ghz at 1.25v where as before I was stable at 1.275v for 4.8ghz and needed 1.3v to boot 5ghz. It can help, but I would say you need to be colder to get anywhere with GPU, and you need voltage headroom too.
post #5 of 8

50-60 degrees on the processor with a TEC means an overloaded cell.

   
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post #6 of 8
Quote:
Originally Posted by Artikbot View Post

50-60 degrees on the processor with a TEC means an overloaded cell.

Not really, I could hit 60°C on my i7 6700k with a evaporater temp of -37°C. My old Vishera on the other hand could overload my phase change unit.

A delidded cpu can make a big difference in this case.

DeScheep

edit: I also saw some strange behaviour in sub zero temperature readout.
post #7 of 8
I'm running delidded and with the block mounted naked (no IHS) with CLU TIM on the die, it's a 669w TEC but I;m only powering it at 12v, so its running at about 220w, but if this is overloaded, then there ain't no other single TEC that wouldn't be haha. It's not overloaded, just haswell is hot, and I only see those temps with LinX and IBT, in games etc I'm in the 20's and 30's. If I bumped the TEC voltage to about 15-17v it would be a bit cooler, but not by much. The point of it is that I can run 5.1ghz stable, 300mhz more than just water cooling, and allows me to do it with less voltage.
Edited by LiamG6 - 1/24/16 at 7:47am
post #8 of 8
Quote:
Originally Posted by Dragon69er View Post

Hello I have a gigabyte 670 windforce card running an overclock of +180mhz and the temperature is 61c on full load, so i attemped a high overclock by blowing outside winter air directely at the gpu with a powerful fan droping my temperature to 19c UNDER FULL LOAD. but my clocks did not even budge, i saw an increase of +10mhz. It would crash if i tried to get an extra +20, additionally voltage on this card is locked at 1.175v. Is increasing the voltage the only way to get higher clock speeds and does temperature just not matter with clockspeeds and is only good to give more mV?

Edit: So my drop of 40c is worthless without unlocking volts?
Theres no reason a 40C drop will not give you a extra MHZ.
To me it seems like a hard ware access plorbem.
To clock higher it would require a unlocked bios or a specail software that allows the card to run properly with increaced MHZ
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