after measuring with voltmeter the fans run at 12v at all times and the speed should be modulated by pwm signal, which the fan slider in afterburner does by the percentage of original design fan speed im guessing... either that or by the pulse duty cycle... idk but not by voltage. according to...
I have swapped the fans on my asus gtx 760 dcu ii with noctua nf-b9 redux. To retain proper pwm control directly from gpu, they are wired to original plug. The original fans ran at a max of around 3000rpm and 700mA combined, the noctuas run at 1600rpm and 200mA combined. Now msi afterburner...