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Ambient temp's effect on PC temps

post #1 of 12
Thread Starter 
Trying to prepare ahead for the summer here, and I got to thinking about how ambients affect CPU and GPU temps.

I am pretty sure the relationship isn't linear, as in, 5 degrees ambient increase does not give 5 degrees increase in CPU and GPU temps. (It's likely higher)

But what are the factors? Obviously there's case airflow and fan speeds, but for arguments sake, let's say they are fixed and maxed out.

So what else? Heatsink design? Is there any (not too complicated) math that can be applied? Rules of thumb even?

I am looking at roughly a 10C increase in room temp in the summertime on the hotter days, compared to now.
Edited by Celoth - 10/30/11 at 10:10pm
post #2 of 12
as long as you still have the same airflow moving over the heatsink i think you will be fine; even though the air itself may be warmer.

i would say it's not just the design of the heatsink and fans but also the build quality from brand to brand.

factors? heat & humidity i would guess.

what are you temps now?
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post #3 of 12
Thread Starter 
Well I am still building my new rig. I am just trying to see if there's anything I can do in advance, instead of going "Oh I shoulda..." once summer comes around.

That and I am just curious how ambients affect the temps overall.
post #4 of 12
I would say the change in temp of the components is less than the change in ambient temps.
post #5 of 12
Thread Starter 
Quote:
Originally Posted by Psykhotic View Post
I would say the change in temp of the components is less than the change in ambient temps.
If the fans/cooling system can pick up the slack, so to speak, yes, I think so too.

From the lack of replies I am guessing the math is hard or there are simply too many variables to this (or a combination)

As for myself, I think I'll just find 2 stable overclocks when I get to that part in my build. One for max, stable 24/7 performance with 20-25C ambients, and a smaller overclock where I really tweak voltage settings as low as possible for the summer where I can get 30-35C ambients.
post #6 of 12
too many variables , as stated .

impossible to tell .

from my experience , expect another 5-10c at most .
    
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post #7 of 12
If you are worried about your ambient being warm when around 30, run your rig with fans on low now, but I would say you will be fine, I have worked around and in server rooms that run warmer then 30 Celsius. You will just find your rig may slow down to allow for the increase.

But if all else fails, buy a A/C for your room.

or

Do what I did, run the heater now and get the room to 35Celsius, replicate summer, only need it for say an hour or so whilst gaming or stress testing (note: your temp's will be lower when gaming compared to stressing)
Edited by ginger_nuts - 10/30/11 at 8:37pm
post #8 of 12
Thread Starter 
Ok thanks.

Yeah I did consider raising room temp temporarily to 35 but I am actually not sure if it's possible with what I have. I can place the computer near the heater though, and I can measure air intake temps with a little probe thermometer thingy I have, so it might work.
post #9 of 12
I can help you out with what I've noticed on my machine. Running BOINC at say 22c ambient, my CPU load temps range from 65c - 68c. At about 30c ambient, load temps range from 69c - 75c.
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post #10 of 12
It really is too difficult to know for certain, due to fan speed variation and the non-linearity of heat-pipes. If you run a rig with no heat-pipe coolers for simplicity's sake, the cpu temperature scaling will not be linear, as the rate at which heat will transfer from the hot heatsink to the cold air is dependent on the difference between the two. the higher the thermal gradient, the faster heat will transfer.

One thing is almost certain though: as ambient temperature goes up, CPU/GPU temperature will go up even faster(excluding heatpipe trickery). How fast, you will have to find out.

Another thing that can be done to simulate high ambient temperatures is to duct the heat exhausts of your case back in the intakes. Some review sites do this when testing power supplies to get very high intake temperatures.

Additionally, in my own crude observations(see rig in sig), I have seen that the rise over ambient of my CPU at idle varies from 7 Celsius to as high as 12 Celsius, which correlates to a actual CPU temperature increasing 2 degrees for every 1 degree ambient.
Edited by khlae - 11/2/11 at 5:02pm
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