Hi I' ve just recieved new entry level mac pro. I used an iMac 27 up to now and, and probably for this reason, My Mac Pro seems noisy. A part of the HDD noise, the main noise source seems to be the fans. What I wan' t to ask you is: If I replace the GPU with a passively cooled card I can reduce the noise substantially? or noise is caused by the system fans and not from the GPU fans? thanks!