I connected videocard fan to SYS FAN on my mobo: ga-ma69g-s3h. Now it rotates all the time with full speed. I want to control it, for example with SpeedFan. Unfortunatelly I can't achieve that. When I change speed of any PWM fields simply nothing happen (only for CPU fan speed changing speed works fine). Do You have any suggestions how can I control speed of that fan?
Many video card fans are controlled with voltage levels, not PWM. If it is the case with your card (which you did not specify) - you won't be able to control it from the motherboard