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Higher Amb. Temp = Higher Clocks

post #1 of 13
Thread Starter 
Well I hadn't thought of this previously, but it seems to be true.

Last night my room was bloody hot, and I could run my 7950GT on ATi Tools at 663/872 without a single artifact.

My room cooled down overnight, and this morning, when I tried to run the test, it artifacted like crazy. I had to bring the clocks down to 640/840 temporarily.

Well, I think it's because the voltage of GPU must increase with an increase in room temperature.

I think my speculations might be correct, but does anyone want to confirm this?
    
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post #2 of 13
Nope, Voltage does not change with only a few degree temperature change. Something else is going on. How long are you running ATITool for testing?
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post #3 of 13
Maybe the resistance of the wires is decreasing as they get warmer?
    
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post #4 of 13
Quote:
Originally Posted by alk View Post
Maybe the resistance of the wires is decreasing as they get warmer?
Actually, resistance increases with temperature in a linear fashion. I know that voltage does vary by altitude, but I am not sure about heat.
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post #5 of 13
Quote:
Originally Posted by bdattilo View Post
Actually, resistance increases with temperature in a linear fashion. I know that voltage does vary by altitude, but I am not sure about heat.
Yup, the molecules are spaced further apart so electron movement is harder.

A 10-20C rise in room temperature will never increase an overclock by 20MHz. (Unless there is a cold bug and your room is around 0C to begin with)
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post #6 of 13
Then we also have delve into the quantum side of things. Electrons will not behave the same in every given situation so an overclock that worked fine for you in one condition may not work correctly in another. Also I find that my overclocks tend to be more stable if I gradually up the clocks rather than jsut boot up with a heavy overclock pre applied.
    
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post #7 of 13
I have noticed that sometimes cores on video cards loose some of their OC potential over time, especially if you play around with voltages (regardless of how well you cool the card). It happened to my 9800pro, 6600gt, 7900gs, and now to my new x1950xt.
Also, it could be that the memory modules are warmer and can't handle the new frequency.
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post #8 of 13
As the card heats up, resistance increases and we get more "memory leakage" which is heat. The added heat makes the card pull more power (watts) because it is less efficient, The voltage in the GPU may have increased a little bit allowing you to achieve that higher clock...
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post #9 of 13
Thread Starter 
Yeah well to give an idea of ambient temps....last night my CPU was idling at 47....this morning it was idling at 37....

Last night I could run the test for 20 mins at 663/872 and not get a single artifact (though 664/873 would raise artifacts right off the bat). This morning even 650/850 would eventually start yielding a few artifacts.

I'll have to experiment some more tonight. And I'm pretty sure some different components react differently under certain temperatures. Some batteries, for example, actually go up in voltage after being used for a while (as they get hotter). Also, a higher temperature, should affect the speed of electron flow, should it not?
    
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post #10 of 13
The battery does that because it is a chemical reaction and all chemical reactions happen quicker when heat is applied, therefore the battery supplies more voltage.
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