GPU temp concern

Mac.teh.Knife
Mac.teh.Knife
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RE: IMO the big thing I

Quote:
IMO the big thing I found in my research of the best way to air cool my system was the quality of the fans. High cfm , hydro bearings rated at at 300000hrs, and low dbls.

Good advice, couldn't agree more with the hydro bearings . It's the best affordable bearing tech in use for computer fan application at this time.

I read a post in some forgotten forum in which the poster claimed he disassembles his PC fans and balances them. A balanced fan of course extends bearing life and reduces bearing noise but it seems like a lot of work to prolong the life of a relatively inexpensive component. If you have the time and the tools though...

I cool my GTX 670 with an Arctic Accelero Twin Turbo 2 . It's very quiet and keeps the GPU temp down to about 60C at 30 - 35% fan speed when GPU usage is a constant 98 - 99% on GPUgrid long tasks. Mind you I keep the ambient temp low. The only thing I don't like about it is the fact that it dumps the hot exhaust into the case. I prefer the stock single radial (squirrel cage) fan because it pushes the exhaust out the back end but unfortunately that fan was so loud I couldn't stand it. I was tempted to send the card back as I am sure the stock fan is defective but my friend offered me the Arctic in return for a small favor so I took it.

robl
robl
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Logforme: Thanks

Logforme:
Thanks for the response to "water blocks". When I looked at your link for water blocks I thought I was looking at plumbing for a water treatment plant. I think I will stay with an air solution.

ROBtheLIONHEART and Mac.teh.Knife:
I looked at the air cooled solutions that you use/referenced in your posts. They look quite promising. Mac, I noticed your location is Canada so I would assume that acquiring a cool ambient air temperature for your environment would be relatively easy and inexpensive. My problem is I live at the "other" extreme in North America. If I can hold an ambient air temp of 78~79 I am doing well. I look forward to winter here but last year and this year our daytime temps are averaging 10 degrees warmer than "normal" (whatever that is). If I were to shoot for a 75 F ambient air temp I would have to shutdown during the summer months. The cost of A/C would be too great. Oh well, it is what it is and we do what we can with what we have.

To all that responded thanks for the input. I have options.

Mac.teh.Knife
Mac.teh.Knife
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You're welcome robl

You're welcome robl :)

It's probably not as cool here as you think. I'm 2 hours south of Calgary, an hour north of the Canada-US border. Summers here can be very hot too, not as hot as yours but in summer a 75F ambient is impossible here too without AC. The reason is that in summer the days get longer the further north you go. At the north pole they have daylight 24 hours a day in the summer. Here in the summer the sun rises a mere five hours after it sets. With 19 hours of sun each day it can get very hot and that's why northern countries grow the best cereal crops in the world.

The winter of course is much different. Often during the winter we have to plug in our vehicles overnight else they'll get so cold the gasoline won't vaporize properly in the engine and the oil gets so thick and stiff you can't spin the engine over fast enough to start it, lol. Sometimes you have to spray ether or propane into the air intake because they vaporize and ignite easily and help get the engine started. The tires are so cold and stiff the part of the tire that was on the road while it was parked stays flat for the first 10 miles so you drive along bump, bump, bump until the tires warm and soften and become round again. Hardened steel tools like road grader blades become so brittle you can snap them by whacking them real hard with a sledge hammer. Some days it's so windy exposed flesh will freeze in 60 seconds. No problem keeping ambient down in winter but summer can be impossible if you have lots of rigs or even just a few GPUs if you let the hot air stay in the house.

Like you said, we all do what we can with what we have. Glad you found some promising options. Happy crunching :-)

ExtraTerrestrial Apes
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RE: I have options. In

Quote:
I have options.


In your case I'd immediately try lowering the fan again until temps barely touch 70°C, or alter your fan curve to keep it like this automatically if you can. This should be a good compromise between temperature, power consumption and fan load.

MrS

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robl
robl
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Right now I am holding 56 C

Right now I am holding 56 C at 73%. Part of this "additional" cooling over a previous setting is due to a "cold front" that moved in and helped cool the ambient air room temps.

I have also modified a script that monitors GPU temps to shutdown the system in the event of a GPU temp that exceeds 72 C. This could only happen should the fan on the GPU card fail or misbehave due to slower rpm.

Do you believe that holding around 70 C would be better in that the load on the fan would be reduced, i.e. a fan at 65% holding a temp of 70 C would be better/less stress on the overall cards performance then my current 73% at 56 C?

EDIT: I have adjusted the fan speed to 56% (was 73%) and the temp is now oscillating around 68~69 C (was 56 C).

ExtraTerrestrial Apes
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If the fan spins higher power

If the fan spins higher power draw doesn't increase linearly, but rather.. probably exponentially, maybe only quadratically. The reason is the transition from straight laminar flow to turbulent flow, with the vortices "stealing" power. That's also why the fan becomes so much louder at higher rpms.

So at some point the power savings from the lower chip temperature will outweight the additional power needed to spin the fan higher. The more complex the GPU is, the more power can be saved by reducing the temperature, so this most benefically affects GK110 and Hawaii. GK104, on the other hand, is a comparably small chip with less leakage, so doesn't benefit as much. If you can measure power draw I'd be interested in seeing hard numbers. The stock config at 80°C is very probably worst. Not sure about the others, though!

Regarding the load on the fan: at higher rpms it will surely last a shorter time. If this will matter for you - know one knows yet. It could be that the fan won't fail in either config during the active life-time of the card, or that it will fail in both cases and needs a replacement anyway. Or the "unmaximised" rpms could save you from having to replace it. If replacing it doesn't bother you, choose the config with the lowest power draw :)

MrS

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robl
robl
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Thanks.

Thanks.

Variable
Variable
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I just installed a GTX 760

I just installed a GTX 760 (MSI twin cooler) and have had it running Einstein & GPUgrid tasks now for a day or so. When it runs Einstein the temps are nice and cool, I'd say 50-55C average running two simultaneous tasks for ~90-95% core load. On GPUgrid the temps go quite a bit higher, like 65C average running a single task at the same 90-95% load. The difference is interesting - anyone have an idea why? Different kinds of calculations loading the card differently somehow?

Either way the temps seem pretty good to me, although the GPUgrid tasks seem to dump enough extra heat out near my CPU to make its fan spin up annoyingly loud. Going to try adding another case fan soon.

ExtraTerrestrial Apes
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RE: Different kinds of

Quote:
Different kinds of calculations loading the card differently somehow


Yes. Imagine it like Einstein being a bit more busy shuffling data around, whereas GPU-Grid taxes the execution units a bit more.

MrS

Scanning for our furry friends since Jan 2002

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