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  1. #1
    ROG Guru: Yellow Belt Array
    Join Date
    May 2011
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    Rampage IV OPT_FAN1 header - cannot control fan speed.

    Hello,
    There is a problem with rampage IV mobo(s). When I connect 4 pin PWM fan to the OPT_FAN1 connector i cannot controll RPM. Mo matter whan i set in bios it still runs full RPM. I connect the same fan to any other connector (for example OPT_FAN2 or CHA_FAN1) and it controlls through bios perfectly so its no the fan. I ve replaced the mobo for another one and this one has the same issue... Any idea whats wrong ?

  2. #2
    ROG Member Array
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    Feb 2012
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    I've had the exact same problem as you, replacement did not correct issue.

    I just gave up and used a different header.

    Hopefully they can do a bios fix.

  3. #3
    ROG Guru: Yellow Belt Array
    Join Date
    May 2011
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    Well i have replaced 2 times now . And it was the same on every mobo . ASUS please check this !

  4. #4
    ROG Guru: Blue Belt Array mdzcpa PC Specs
    mdzcpa PC Specs
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    I found that running Duty Mode is the best way to control fan speed on OPT_FAN 1. Using 50% for me works great. However, I use Duty Mode for all three OPT fan headers and I think that might be the key to controlling all the fans correctly.

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