A technology company I regularly talk to told me about this cool little tool that can really help keep your Mac Pro cooler by increasing the Fan RPM's inside the box. What's really nice is that the change in RPM is completely silent.
It's freeware called SMS FanControl and it's up to version 2.1.2. After installation you simply set the RPM you want for the various regions of the machine. In the case of the Mac Pro there are four regions and the default for these regions are 500 - 600 RPM. The folks suggested I set everything to 1100 RPM and within 5 minutes, my Mac Pro dropped from 95 degrees internal temp to 76 degrees internal temp. I know this because the tool also displays the current temperature at all times in the Mac toolbar along with actual RPM of the fans. As the day goes on my machine seems to hover between 76 and 82 degrees.
As we all know, heat is a killer of computers and I wonder if excessive heat is causing some of the unexplained crashes and problems some folks seem to experience with the Mac Pro. According to the website this also works on MacBook Pro's but I'm only running it on the desktop machine. Very neat little tool and wanted to pass it along.