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Old 29-01-19, 11:19 PM
Nine Iron Nine Iron is offline
Join Date: Dec 2012
Location: St Helens, Merseyside
Posts: 165
weird fan PWM fan behaviour

I've got a 1060 Mini whose cooler I am about to replace with an aftermarket one. The stock fan is PWM with a small connector and I've got an adapter to plug a normal PWM fan/s into it.

However, I've tried two different PWM fans via this adapter and the PWM control doesn't work; the speed is reported as ZERO in GPU-Z (the stock fan reports correctly). There is continuity on every wire of the adapter - I've checked with a multimeter.

Any ideas what could be going on?

Ryzen 5 3600
Asus B450-F Strix Gaming
16GB Patriot Viper Steel 4400 MHz
Gainward 1070
ADATA SX8200 512GB, Intel 660P 2TB
Corsair RM650x

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Old 30-01-19, 07:54 AM
tgrech tgrech is offline
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Join Date: Jun 2013
Location: UK
Posts: 1,980
Make sure everything is 4-pins, the GPU fan header should be a teeny tiny JIT 4-pin connector, the adapter should have 4 wires, as well as the fan you connect to it. Presumably you're testing this with a full sized fan? Is the fan at 100% speed constantly when connected? If you have an oscilloscope at hand maybe try reading the tachometer line? (A multimeter should give a basic indication if the values flick around)?

My GPU has an aftermarket cooler too, though it was a 2-pin model with no tach or PWM lines, controlled via voltage, have you checked your cooler will be a full 4 pin as well?.
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