fans not running at low speed

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Eric_147

Commendable
Jan 16, 2017
7
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1,510
For some reason my GPU fans only work at 83% and above. Its a R9 280x. I'v tried manually changing it in radeon settings as well as afterburner and both have the same issue. If I turn the fans to 83% and they come on, then turn them down to 76%, they slow down accordingly but any lower and they just turn off. The connection on the GPU seems fine.

I also removed the fans and tested them on my benchtop power supply and they work fine all the way down to ~3V, but now when connected to the GPU.

Any ideas?
 
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Eric_147

Commendable
Jan 16, 2017
7
0
1,510


The GPU temp climbs quickly at the low end where the fan should be spinning slowly but doesn't. If I leave the fan speed profile on auto, it adjusts fan speed as temperature rises like normal (say 50% at 40C) but the fans don't actually spin until it hits 83% which is around 70C. This is the same at idle as it is under load, it just takes more time to heat up on idle.
 
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salerhino

salerhino

Reputable
Mar 16, 2016
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5,660


I had same problem with old GPU which is HD6770 - the problem was fan itself because it's oil, which fan uses to spin obviously was dried. I tried pouring new oil - worked for 2 weeks, but then dried again as it is not real proffessional oil. I ended up buying replacement fans.
 
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Eric_147

Commendable
Jan 16, 2017
7
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1,510


I thought this might be the problem but when I take the fans off the GPU and power them separately they work fine. It would seem that the GPU is sending the incorrect voltage and/or not enough current.
 
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Eric_147

Commendable
Jan 16, 2017
7
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1,510


I don't see where it shows GPU fan voltage in HWINFO. Its an older card, out of warrenty.
 
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Pkai92

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Oct 20, 2016
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1,860
You will see the GPU's voltage. Is this issue new or it was since you bought the Gpu? What's the manufacturer of the Gpu ? Like Msi, Evga etc. Can you tell what is the temperature at idle ?
 
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Eric_147

Commendable
Jan 16, 2017
7
0
1,510


GPU voltage is usually around .950VDC. Its an XFX HD7970DD. This issue has been only going on for about a month or so.

The temperature at idle is dependent on the fan profile I have it set to. In auto mode it starts around 35C and slowly creeps up to 80C which is where the fan profile brings the fan above 83% and the fan finally starts spinning and cools it back down.

I don't really want to get a new GPU just because of the fans. It still works well otherwise but its really annoying having the fan go on and off at nearly full speed constantly.
 
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Eric_147

Commendable
Jan 16, 2017
7
0
1,510


Thats the default profile. I change it to keep it cooler but it means it runs at 83% and above at all times which is loud.
 
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