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Adjusting the speed of the video card fan

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Tyzemn
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2017/12/17 09:03:12 (permalink)
Hello everyone, not long ago I bought the EVGA GTX 970 SC ACX, and noticed that it makes a noise in idle time. I looked at the sensors through the GPU-Z and there the cooler costs 35%, which is already a lot, but the fan speed is 1578 rpm, which is already 45%. I tried to edit the speed of the coolers in the bios card using the maxwell bios tweaker utility, and I ran through nvflash. In general, the minimum speed threshold was 20%, but they all rotate evenly to 1500-1600 rpm. When trying to increase the cooler's speed in MSI AfterBurner, up to 45% does not react at all, which is confirmed by my calculation. Help please how to solve this problem.

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    ty_ger07
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    Re: Adjusting the speed of the video card fan 2017/12/17 09:37:01 (permalink)
    The fan speed tweaks in the BIOS editor don't work correctly. I would recommend going back to the original BIOS.

    The minimum fan speed is likely controlled by the fan itself -- according to PWM fan specifications -- so, the fans probably won't ever spin slower, no matter how low of a duty cycle % you provide, while using the standard PWM control specification. Inside the fan is circuitry which is provided 12v for fan power, a ground for power to return, a PWM wire to tell the fan how fast you want it to turn in % duty cycle, and a tachometer feedback wire to tell you how fast the fan is actually turning. According to the PWM specification, that circuitry should be designed to ensure that the fan never stalls and ignore duty cycle percentages below pre-determined levels.

    EVGA's current 0db fans are actually against PWM specification, but I wouldn't be surprised if EVGA's fans used to follow PWM specification with a minimum speed enforced by the fan itself.
    post edited by ty_ger07 - 2017/12/17 09:40:11

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    bob16314
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    Re: Adjusting the speed of the video card fan 2017/12/17 10:39:09 (permalink)
    Welcome to the forums.
     
    A fan mod for my card (single fan 760 SC) is shown below with a minimum of 1200rpm..Make sure you're editing the VBIOS correctly.

    Tried a zero-fan mod but there's a limitation somewhere that won't allow it to go below around 900rpm..I can raise those minimum fan speed numbers to a higher rpm, but not much lower.

    Your card's fan control will be different, just posting this as an example of what I changed to achieve my mission objective.
     
     
     

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    Sajin
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    Re: Adjusting the speed of the video card fan 2017/12/17 13:34:11 (permalink)
    ty_ger07
    I would recommend going back to the original BIOS.

    +1


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    Dave3d
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    Re: Adjusting the speed of the video card fan 2017/12/17 18:42:38 (permalink)
    How do you know how high rpm your fans will go?
    I would like to do that fan only mod, where my fan is on 100% all the time, so I dont have to use msi afterburner to do it.
    Titan X (maxwell) regular, evga, regular blower style cooler.
    I actually wouldnt mind 50% at startup, then as the temp gets to 50c, make it go to 100% all the time?
    Can someone teach me how to do that?
    Or, is there a section for doing this (not in the videop card section?) that you can link me to, so I can ask there?
    Thanks.

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    Dr.Death
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    Re: Adjusting the speed of the video card fan 2017/12/18 07:54:15 (permalink)
    seems to me that if the fan was right   like sais the bios settings control that    . don't that card have that -0- fan thing anyway??   cause then it should not even spin up in till a temp is reached like say 60c   then the fan should spin up   to a bios set point  lest say 20%   then if or as the card gets hotter  say by 10%  [60c= 20% speed-  70c maybe 20/30%  and so on ] 
     
    most of these larger GPU fans are rated for max  3000 - 4500 rmps    but you would have to check the OEM specs on that model of fan used 
     
    like this power logic  from a old card of mine 
     
    PLA09215B12H  [3500rpm ]
    http://www.powerlogic.tw/images/pdf/power_vga_fan_2012_06_05_44241.pdf
     
    I got abnormal / erratic  fan behavior  from it  and just replaced the fan with one from a old known working card I had in a junk box   and all was good    and worked correctly   speeds and temps    
    , so the fan was just going bad not the card
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