CPU fan RPM drops after updating bios


Today I've updated the bios from 0207 to 0404 latest version and I've noticed a significant drop in RPM on my CPU fan. From 2100 RPM to 870 RPM. after updating the bios and restarting it ask me if I wanted to select the bios default settings and I chose OK. Note that I don't use EPU-4 Engine, although when I did some tests a while ago, when I chose the "Max Power Saving Mode" or "Auto Mode", RPM also dropped from 2100 RPM to 870(relative). I don't know what to say about this, maybe it's just a coincidence.
Does anybody know why my CPU fan RPM dropped that significantly and how to fix it?

Motherboard: Asus P5P41D
CPU: E7500
3 answers Last reply
More about drops updating bios
  1. Welcome Newcomer! :)

    The CPU fan speed varies whenever connected to CPU_FAN. To verify that the BIOS is correct, Load Optimized + any special BIOS required {e.g. RAID}.

    To further test your system, run Prime95 {stress test} with CPUz {monitor temps} > 60C-70C on stock quit the test.

    CPUz - http://www.cpuid.com/softwares/cpu-z.html
    Prime 95 - http://www.mersenne.org/freesoft/
    {WIKI - http://en.wikipedia.org/wiki/Prime95 }

    Testing & Benchmark Tools: Prime95, CPU-Z, CoreTemp 0.99.6, Memtest86+, & 3DMarkVantage

    1. Prime 95 as a "Stress Test" [overnight.]
    link - http://www.mersenne.org/freesoft/

    2. CPU-Z for Hardware & Settings Summary
    link - http://www.cpuid.com/softwares/cpu-z.html

    3. CoreTemp 0.99.6

    4. Memtest86+ to check memory corruption
    link - http://www.memtest.org/

    5. 3DMark Overall System Performance Benchmarks
    link - http://www.futuremark.com/benchmar [...] roduction/
  2. Hey, Thanks for replying. I've found what the "problem" was, the Q-Fan option was enabled. It seems that this version of bios enables it by default, I actually checked the bios settings twice before posting, but somehow omitted that option, so sorry for that.

    For the ones who are interested in this subject I did some tests and found out the performance is exactly the same whether Q-Fan is enabled or not, however the CPU temp it's a bit lower (about 5 degrees celsius) if Q-Fan is disabled (obviously since the RPM is much higher).

    I did some tests with a few apps, I got almost the same results from all of them, so I'll just post the temps and RPMs from Crystal Mark:
    41 °C - 2240 RPM - peak load Q-Fan disabled
    46 °C - 920 RPM - peak load Q-Fan enabled

    I don't really know how good these tests are, probably not that good considering that it doesn't stress out the CPU to the maximum.

    And temps in idle:
    32 °C 1900 RPM
    33 °C 870 RPM

    So from those tests it seems that for about 1400 RPM extra you get -5 °C, which doesn't really seem to be worth it.. I don't know...perhaps someone knows more about this...
  3. You're fine - nothing to even think about. Personally, I don't like any MOBO utilities; they cause more problems than they solve. I don't like my BIOS being manipulated by an App(s).
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