ok so I have some cool master fans, set to performance mode on the actual fan. These fans are connect with a pwm to the motherboard. I an using a "ek-cable splitter 4 fan pwm extended". This connects my fans and motherboard and also has a molex connected for extra power. I have been onto my asus suite and changed the fan speed down and this does nothing. I have just had a brain wave, could this be because on the splitter the pwm isn't working and the fans are running full power from the molex?