Okay, first time posting, but have been browsing for a few months now. I am looking for some information about mac pro fan speeds, i purchased my mac pro in mid september and it was running flawlessly, quiet, and quick. It is a dual quad 3ghz processor with 2gb of ram, nvidia geforce8800 gt 512mb video card and a 500gb hard drive. Within the last few months, the computer starting to get very loud due to high fan activity. I brought it to the Apple store tonight, and obviously it was running quietly there. When i got home, it was running loud again, and I downloaded an app that let me control my fan speeds. Below is my current fan speeds as well as what they are set at. After setting the fan speed down to being the max 1000rpms, it seems to be running pretty quietly and I only hear a little bit of fan noise, however I know that if you put it to low you can fry the computer, so I don't want to risk this happening. I am new to the mac world, this is my first mac but I have used them at school for the last few years in my graphic design courses, however when it comes to technical issues, I know more about PC's, but its changing everyday and i'm learning more. Is this safe to run: Mostly what I'm worried about is that power supply fan being to low. Thanks in advance!