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I've recently replaced my fans (CPU, GPU, and bought a CHA fan). The GPU remained the same, but I've seen it when it was spinned 2 times faster, than it usual... but it is rarely.

The problem is, that the CPU fan in Windows (especially 7) spinned too much, 'cos it keeps in under 40°C, and it is spinning with 3300-3600 RPM, which is too high I think. If I swich to Ubuntu, it keeps on ~40-45°C with with 2500-2800 RPM, which is a big difference in numbers, and in noise.

I'm looking for a manual fan control solution, or just reduce the Windows' multipliers of fan speed control, somehow... I was bought the new fans because of the lower noise (and it does it, but not with 3.6k RMP).

Thank you!

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closed as not a real question by techie007, Indrek, 8088, Tom Wijsman, Diogo Sep 3 '12 at 17:45

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

Drivers... All of them! –  Tom Wijsman Sep 1 '12 at 11:50
Thanks, but whose exactly? –  B. Roland Sep 1 '12 at 16:12
Yours, who else? –  Tom Wijsman Sep 2 '12 at 12:16
but which of mine?! –  B. Roland Sep 2 '12 at 14:41
Told you.. All of them! –  Tom Wijsman Sep 2 '12 at 15:10
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2 Answers

I think it is solved. I've modified the Q-Fan feature in the BIOS (Asus M2N-X). I've raised the start temperature to 45°C, and it is now seems to be working...

If there is something changed, I'll write... the testing is just begun.

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Weird, because that doesn't explain the NT / Linux difference. –  Tom Wijsman Sep 1 '12 at 17:11
But there was difference... –  B. Roland Sep 2 '12 at 9:13
What kind of difference? –  Tom Wijsman Sep 2 '12 at 12:17
Ubuntu handeled it right. But windows not... –  B. Roland Sep 2 '12 at 14:40
So, how does one explain it? –  Tom Wijsman Sep 2 '12 at 15:10
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If the only thing you changed was the fan(s), then that is the answer to your mystery: the new fans are different. They may be different brands and/or models, may have more blades, may have different lowest/highest speeds, may have different CFMs, may have different noise levels, may be different sizes, etc. You didn’t specify the differences, so any or all of these may apply, which of course affects the cooling power of the fans, and thus their rotational speed and noise.

Since you are getting the same temperatures in Ubutunu at different speeds, it seems that the default speed logic in the BIOS (and/or Windows?) is not as effective for the new fans as it was for the old ones or the logic in Ubuntu. You can try using a dedicated fan-monitor and -controlling program such as SpeedFan. It allows you to set ranges so that the fans are slowed down or sped up to achieve a desired temperature (not to mention all kinds of other functions like monitoring, logging, etc.)

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