Second problem with installing the Accelero GPU cooler to my 8800 GTS was that the card didn't start up without any RPM pulses from a fan connected to the fan connector on the card.

After some searching I found that the fan connector pinout is the same that is used in new PWM controlled CPU coolers so I cut the connector and wires from an old GPU fan (from my broken 8600) and soldered a bigger 4-pin connector (the pinout is the same, just matched the wire colors and that was it) to the other end to make an adapter where I could plug in a 4-pin CPU fan or just a normal 3-pin fan to get an RPM pulse to the card.

I used an Intel stock cooler to test the system and it worked well (the PWM controlling worked also) and the card powered up finally. That was just a test setup and at the moment I'm just taking the RPM signal from a case fan to get the card running and there is a separate 12cm under the card to cool it down.