I have a video card that is loud while idle, because the fan curve appears to be set rather aggressively. Unfortunately, this can not be changed via software.
The fan is connected with a regular 4-pin PWM header (black, red, yellow, blue).
I have some low-ohmage resistors (20-40 Ohms) and would like to try to limit the voltage supplied to the fan to find out if it solves the issue.
Normally, such adapters are available for 3-pin fans with a resistor on the positive lead. However, I am unsure if the same is possible with a PWM-controlled fan.