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Thread: Using high rpm fans with a fan controller

  1. #1

    Default Using high rpm fans with a fan controller

    Are 3000RPM 120mm fans safe to use with a fan speed controller? They push a LOT of air. Is turning down the RPM safe??

  2. #2
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    Unless they're AC operated, I can't see any problems.

  3. #3

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    Don't see why it would be unsafe if the power rating of your fan speed controller is up to scratch. If it's sized for a fan with a smaller current draw, the magic smoke might get out. It is unlikely to be as efficient to take a high-speed fan and turn it down a lot, as it is to take a low-speed fan and turn it down only a little.
    Last edited by justanotherhacker; September 24th, 2019 at 08:53 AM. Reason: stupid typo drawer->draw.

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    Compare the amp draw of the fan to the per channel amp limit of the controller. If its too low, you're most likely going to burn something up.

    I've seen people put monster delta fans on fan controllers thinking they could handle the massive current draw and the thing goes up in smoke after they power on.

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    Big fans big noise.
    Surely not everyone was Kung-fu fighting

  6. #6
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    Maybe describe the specific details, setup and whatnot, and why you feel the need for high output. I still have to arrange fans for my xeons, especially the dimms as they get very hot. The only solution that seems practical is to mount them on dummy expansion cards, utilizing the 2 pci-x slots that I don't foresee having a use for.

    I was going to get an automotive radiator fan and jury rig that in somehow. It would look so friggly though. Everything would be nice and cool though.

  7. #7

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    Simply put, I want my new main PC to run as cool as possible and also so the parts live longer, that's why. I don't know how much airflow is needed. I'm paranoid of my hardware overheating, so no games until I install an LED front bay temp monitor. The CPU is 85W, the rest of the parts are low power. The graphics card only takes 17W and is passive cooled. I'm using the NZXT Adamas case with Scythe 120MM fans, each 3000RPM and 0.60A. The fans on the side panel are the same brand but have a little less RPM and are 0.53A. The CPU fan is 80MM, 3800RPM and 0.68A. I don't like the noise so much, but whatever it takes to make sure my PC is healthy.

  8. #8

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    Is too much airflow in a PC case even a thing? I'm going to add in fan filters the help prevent rapid dust buildup.

  9. #9
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    Quote Originally Posted by computerdude92 View Post
    II'm going to add in fan filters the help prevent rapid dust buildup.
    keep an eye on the filters, especially if the case is sitting on the floor
    also, the filters go on the incoming air side
    so if you don't have a fan pulling air in, the filters need to go wherever air is being drawn in

    too much airflow just means the filters will clog up faster

    I generally build systems with passive intake and active output behind the hottest parts of the system

  10. #10
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    Quote Originally Posted by computerdude92 View Post
    Is too much airflow in a PC case even a thing? I'm going to add in fan filters the help prevent rapid dust buildup.
    Only if you have so many fans blowing out and not enough air coming into the case AND you have an old style case where the Power supply has to fight for that air coming in to cool itself (new cases put the PS in the bottom with a cutout to get air from outside the case).

    Generally on a new system you need to run Coretemp and GPU-z to monitor temperature of the CPU and GPU during heavy use on a hot ambient day to see if you are going to have a problem.
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