I've got some 4 amp Delta PWM fans that are far too noisy at full speed but I'm hoping they could work quite well if controlled. I know they draw far too much power to be just plugged directly into the Aquaero 6 fan header so I've tried running power from a molex and PWM and tacho to the fan header. With just power attached, the fan runs at full speed and tries to take off down the desk. With the fan header attached as well, it stops...even with the fan set to 100% and PWM mode. Does the Aquaero need more than just two pins connected before it will work or am I doing something else wrong?

Delta wiring is - as far as I can tell:

Black : Ground - attached to molex (black)
Red : 12V - attached to molex (yellow +12V)
Yellow: Tacho - attached to Aquaero fan header pin 3
Blue : PWM - attached to Aquaero fan header pin 4

Many thanks,

Gareth