Tiger K8W--who/what controls fan speed?

Discussion in 'Tyan' started by Lachoneus, Apr 5, 2005.

  1. Lachoneus

    Lachoneus Guest

    I recently built a dual-Opteron workstation using a Tyan Tiger K8W
    motherboard and a pair of retail box Opteron 246 CPUs (2GHz, 130nm), in
    an Antec case with a pair of 80mm exhaust fans and a dual-fan 400W power
    supply. The system is acceptably quiet when I first turn it on, but in
    just a few minutes the CPU fans wind up from the 3500RPM or so that they
    start at all the way up to about 6000RPM--making a deafening racket.
    But the CPU temperatures read about 42C under moderate load; not hot
    enough to justify that high a fan speed, at least for not a workstation
    (it'd be just fine in a noisy server room).

    So who/what is causing the fans to speed up that high? Does the
    motherboard increase the voltage to the fans when the temperature goes
    up, or do the fans themselves contain temperature sensors? Is it
    possible to adjust the speed ramp? I wouldn't mind trading a few
    degrees for some peace and quiet, as I'm not overclocking or anything
    (just developing multithreaded software, and I need multiple real CPUs
    to test it properly).
    Lachoneus, Apr 5, 2005
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  2. Lachoneus

    silence4you Guest

    change the cpu fans. I have 2 verax on my tyan and you can lay your
    ear on the pc to sleep. They are expensiv but realy the best. Only a
    watercooling is better. look here: http://www.verax.de
    or http://www.veraxfans.com/
    silence4you, May 4, 2005
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