Question why are my fans on my PC always running at full power

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Tal58

Jun 16, 2020
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I recently got a pc and the fans have been extremely loud. When i am not doing much on the PC, according to NZXT my CPU stays at about 38-50 degrees C, which I think is very low. When I play the PC stays at around 70 degrees or maybe cooler depending on the game. If my fans are constantly on full power which I think they are, how do I fix this. Is there some setting in BIOS.
 
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Are they 3-pin fans? Are the fans connected to the power supply?

Both of these things cause them to run at full speed. If you have 3-pin fans (only 4-pin fans ramp up in speed as the components get hotter) connected to your motherboard, go into BIOS and switch the fan control mode to "DC/Voltage".

If you have the fans set on PSU, they will run at full speed all the time since the PSU just sends a constant voltage to the fans.
 
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Tal58 said:
I dont know if they are 3 pin fans how do i check>
also youre saying if the fans are 3 pin fans theres no way to fix it?
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The fans have a cable that needs to be connected to motherboard in order to function. Open up the PC and check if the fan cables (should be connected to a SYS_FAN or CHA_FAN header on mobo) are 3-pin or 4-pin. If they're 3-pin, you can control the speed if you set the fan control mode to "DC/Voltage" in BIOS.
 
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Tal58 said:
but how do i know if my fans are 3 pin or 4 pin
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Take out the cable and check how many holes it has.

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the cable I see from one of my fans goes from the fan to the motherboard. Should i check the cable that goes to the fan or goes to the motherboard. Also, should i assume that if one fan is 3 pin then the other ones are also 3 pin. I don't know a lot about this stuff and don't want to tinker and mess something up.
 
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Tal58 said:
the cable I see from one of my fans goes from the fan to the motherboard. Should i check the cable that goes to the fan or goes to the motherboard. Also, should i assume that if one fan is 3 pin then the other ones are also 3 pin. I don't know a lot about this stuff and don't want to tinker and mess something up.
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Check the one that goes to the motherboard, it's the only one you can check. Take it out, see if it's 3 pin or 4 pin, and place it back. Then report back here.

And yes, the others should be the same.
 
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the cable goes from the fan to the block on top of my ryzen CPUm not directly into my motherboard, is that where I should unplug from. Also, I tried unplugging but It would not budge, should i try pulling harder or does that mean its not supposed to come out
 
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Tal58 said:
the cable goes from the fan to the block on top of my ryzen CPUm not directly into my motherboard, is that where I should unplug from. Also, I tried unplugging but It would not budge, should i try pulling harder or does that mean its not supposed to come out
Click to expand...
Before doing anything take a picture and upload it to imgur, then link it here, that description is a bit confusing
 
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I am not 100% but when my pc is idle or not doing much the pc according NZXT is aroudn 40 degrees C which is very low and my pc is very very loud, so I assume it is running faster than it needs to be, especailly since when I am playing games the PC temperature raises obviously but the fans don't get any louder. my specs are:
Ryzen 7 3700x
AMD am4 prime b450M-A motherboard
2x8 gb Ram at 3000mhz

I think those should be the only relevant specs but I also have
RTX 2070 super
1tb nvme ssd
 
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