Hi. I got an old G4 Digital Audio as home server / seedbox, and recently i got fed up with the horrible noise and as a first step i replaced the 120 mm fan with a new and quiet one, and it is working perfectly. However, when i replaced it i noticed that the CPU fan is now the loudest, and a computer that is on 24/7 can never be too quiet. Can i replace the CPU fan with any fan of the right size? Are there any requirements regarding fan speed/air throughput? Do i have to connect the fan to the non-standard two pin connection where the original fan was connected or can i just use a normal 3 to 4 converter and connect it to the spare 4 pin power outlet?