Hoping someone can help !!!!

I have a P4 3.06 gig with a standard Heat sink and variable speed fan attached. I took it off and cleaned the dust/fluff from the fins as it was starting to get up to the 70 deg celcius temp. The fan was running at a nice 3000 rpm before cleaning.

After cleaning it I applied some artic silver and reassembled it. It is now running at a nice 40 deg celcius but the fan speed is now running between 3000 & 4800 rpm and getting very noisy. I want to kow if there is a way to fix the fan speed at a constant 3000 rpm to reduce noise.

The setup is
P4 3.06 gig standard H/S and fan
Gigabyte 8SQ800 Ultra motherboard

Using speedfan 4.08 to monitor

OS is win XP pro and Win 98 SE


cheers gurry