Question about Gateway 831GM PC Desktop

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Gateway 831GM Eratic Fan Noise

Ok, I have a Gateway 831GM with a loud rear system fan.
The fan is a 4pin 90mm hydrolic ATC brand. I opened the chasis and cleaned out all of the dust then noticed that the rear system fan was still eratic - fluctuating RPM's - higher then lower, slow then fast.
I ordered the exact fan then replaced the old fan.
The PC worked well for a little while; several hours, but it started the eratic RPM's again with the new fan.
Could this be a power supply problem, if so, if I have a bad power supply could the power supply have ruined the new fan? I hate to have to shotgun parts.
Thank you.

Posted by on

  • vannost Apr 24, 2009


    Thanks for that great answer. I have a few follow up questions.

    The 4 pin to Molex connector - would the connector attach to the motherboard (male side) or the female end of the 4 pin connector?

    Also, is the temp sensor a chip on the motherboard or a FRU that I can order?

    Thank you.



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This can be caused by several things:

1. Bad temp sensor
2. Bad voltage, but that will usually cause the whole system to restart
3. Too low maximum temp setting inside the chassis(setting is in bios), often denote as max case temp.

One way to bypass the problem is rig the fan to a molex adapter with a variable voltage molex to 2/3/4pin fan connector and adjust the speed to the maximum quiet setting.

The 831's did run a bit warm so if the case temp setting is set to low it will fluxuate quite a bit. Try adjusting the max case temp up around 50c just to see if that does it, if it does either use the variable voltage dial solution or add a second case fan that's always on, prefferably a low RPM running direct off molex so it will reduce the average temp and therby the need of the monitored case fan to rev up.


Posted on Apr 24, 2009

  • Chris
    Chris Apr 24, 2009

    It connects to the female end on the lead from the fan but will not allow RPM adjustments/control.

    Temp sensors vary but are generally attached permanently to the motherboard and must simply be disabled if they fail(not the safest solution). For a few extra bucks though you can get replacement/add on fans that include case temp sensors built onto the power lead which are a good idea.

    I have seen enough of these fail though that as a precaution my main PC has two after market exhaust fans and 4 intake fans which including the PS fan and Vid Card fan gives it a 1.5:1 intake to exhaust ratio, a ratio I have always favoured in gaming systems or systems than run 24/7

    ps. Never ever run an adapter from the Molex to a fan block connecter on the mobo as you could cause a nasty short and potentially fry the mobo.

    Glad the answer helped,




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