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Thread: PC Freezes when I change the fan controller settings?

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    Default PC Freezes when I change the fan controller settings?

    I built a PC about a month ago (see it in excruciating detail here). The key components are:

    Fractal Design Define R4 case (built-in fan controller)
    EVGA Supernova 750 G2 PSU
    AMD FX-8320 @ 4.0 GHz
    ASRock 990FX Fatal1ty (Killer) motherboard

    I am running the CPU Cooler fans (Phanteks PH-TC14PE) through the motherboard headers, but I use the R4's built-in fan controller for the case fans. The title is the story - if I change the fan controller position, the computer freezes. I rechecked my cabling, which is fine, and the only way the controller is connected to anything besides the case fans is through the PSU. It uses a Molex connector. I can't fathom what would cause this to happen, it's just a fan controller.

    I noticed the behavior from the start, just didn't worry about it and hoped it would go away. It didn't. I have since noticed that it seems to happen more when I turn the fan voltage up than when I turn it down - not that I've done a lot of testing, because I don't want to hurt anything. This is not a major workflow issue, but slightly worrisome because I don't know the cause.

    What might the problem be? Should I be concerned? Should I just restart my computer if I plan to turn up the fans? If I need to RMA something, which thing is it?

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    As a temporary workaround (while waiting for a proper fix), cannot you hook up the case fans to the mobo headers?
    Best, Luca

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    I think that the case has a medium setting which uses the 7V trick (+ on 12V, and - on 5V). Maybe the PSU doesn't like having that done to it while running?
    No wonder it doesn't work! You installed the coils backwards

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    Quote Originally Posted by c_hegge View Post
    Maybe the PSU doesn't like having that done to it while running?
    Callum, I think that's how fan controllers works: you crank them up or dial down when the PC is running, don't you?
    Best, Luca

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    Quote Originally Posted by quest for silence View Post
    Callum, I think that's how fan controllers works: you crank them up or dial down when the PC is running, don't you?
    That was my understanding - at least I feel I should be able to do that.

    Quote Originally Posted by quest for silence View Post
    As a temporary workaround (while waiting for a proper fix), cannot you hook up the case fans to the mobo headers?
    I certainly can try that - if I like it that way I might even leave it so that the fans all throttle together, but I am still worried that I might have a faulty component.

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    Quote Originally Posted by UTL View Post
    but I am still worried that I might have a faulty component.
    Yes, I know, having those freezes is not normal.

    A simple and straight move to rule out the PSU would be to put in a different, known, working PSU and then re-test the fan controller switch.
    Another simple move to check some cabling short would be to put the current rig outside the case, and then re-test the fan controller switch.
    Best, Luca

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    Are you monitoring your temps during this time?

    And does it freeze as you are physically adjusting the fan speeds, or after you made the change? I am wondering if it happens only when you are actually adjusting the voltages, if the sudden and unexpected change in the load on that rail is confusing the PSU's protection circuits?

    Personally, I don't like fan controllers - other than those already integrated into the motherboard's chipset for the CPU fan and the PSU for its fan. I have seen too many problems when users fail to monitor temps when turning down the RPMs because the fan noise is objectionable. I would rather they swap in better/quieter fans (or move a front fan to the rear).

    Also, a lot of users complain of buzzing when running through some controllers.

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    Quote Originally Posted by Digerati View Post
    Are you monitoring your temps during this time?

    And does it freeze as you are physically adjusting the fan speeds, or after you made the change? I am wondering if it happens only when you are actually adjusting the voltages, if the sudden and unexpected change in the load on that rail is confusing the PSU's protection circuits?
    I don't mind the temps too much - I first noticed it trying to turn up the fan speed preparing for more intense computing, and the noise isn't an issue for me. I built it to do work on. But good comment!

    You're thinking along the lines that I have been - a sudden load change messing with the power supply. The hard thing for me to accept is that it's a Superflower PSU, and shouldn't give me any trouble. I'll get in touch with EVGA's support and see if they have a suggestion.

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    Quote Originally Posted by UTL View Post
    The hard thing for me to accept is that it's a Superflower PSU, and shouldn't give me any trouble.
    Without any countercheck with a different PSU, that's a groundless thought.
    Best, Luca

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    I don't mind the temps too much
    If you are not going to monitor your temps don't use fan controllers! Take the fan controllers out of the fan circuits, connect the CPU and system fan directly the applicable motherboard fan headers, and the remaining case fans directly the power supply.

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