Originally Posted by ooostephen
My board only has 4pin PWM headers, but still the pumps two pin connector doesn't work. The other 4pin PWM fans work and are controlled by the BIOS. Software, like SpeedFan or Asus's tuning utility, can add further control but is not necessary. There must be a way to get the PWM signal to the pump....argh!
The two pin setup should plug right into the normal 4 pin setup, it just doesn't have the power leads like a normal fan would have, because it gets it's power directly from the PSU. You really have to use Speedfan, or other utilities like that. Controlling it from the BIOS usually only has a few settings. Quiet, low, medium, high, extreme are the 5 settings on my BIOS, and each interval increases it by 20%. The pumps do NOT offer a complete range of control. At 0% PWM it will have 1200RPM, at 60% PWM it will have 4500RPM, which is the max RPM on the pump. So, for instance, if I set my motherboard to "medium" setting it will be 60% PWM, which is max RPM.
Plug it into a PWM fan port and boot up speedfan. Check to see if it has the RPM signal from the pump, which would be 4500RPMS since it defaults to max, typically. Then set it to 0% pwm, and see if the RPMs drop to 1200.