I put it in cpu fan to replace a radiator COOLMASTER COOLMASTER on a V8. The motherboard is an ASUS Rampage 2 Extreme. If the processor is below 39/40 °, the ASUS believes that the fan is at 0 rpm and so I have a cpu fan error message at startup. Via detection software (speedfan) only between the fan 375 rotates (above 40 ° if 0 rpm while the fan is running) and 715 rpm. The PWM function works, but I'm disappointed for a fan being announced for 1300 rpm ...