What is the maximum fan speed acceptable ?

[QuintLeo]

Temperature DOES affect semiconductor power draw, hotter = more, this is actually very old news and is the cause of "thermal runaway" situations.

 On realistic terms though, it's not a BIG effect. I'd worry more about "keep them cool to keep them lasting longer".


 And like I've already mentions, GOOD fans don't die when run at 100% of design speed for quite a few YEARS - a good ball-bearing design should still be alive by the time the GPU it's on is almost worthless from being too old and outdated. It's the CHEAP sleeve bearing fans the DIE YOUNG (I count the derivitives as well, like "hyrdo" and such - they're stlll SLEEVE bering and reliant on being lubricated to not sieze up over time - ball bearing fans run FINE for long time with no lubrication at all, just don't let dust jam them up.

[1337leet]

Don't know if anyone came up with the argument that the cards consume less energy if they are colder.

I always run all my cards with 100% fanspeed.

My cards consume about 200 watts at 55 degrees celsius each. At 75 degrees it's more than 220 watts each.

With 5 cards you can save 100 watts just by running them at lower temoperatures.

oh didn't know about that, can you provide proof of this? temperature should not affect the consumption, otherwise all the big farm would consume a lot since they stack rig one above another

I do have a device that measures the energy consumtion at the wall.
I'm not quite sure how this works. But it's definitely fact that they consume less power if they are colder.

You can place rig over rig as long as the airtemperature is low.

I use a vent pointing at my rig to keep it cold. If I turn that vent off the temperature rises from like 55 to 70 degrees and I get ~ 100 watts more power consumption then.