I've been having a lot of problems with heat in relation to my firewire audio interface on my MacBook. Initially I thought it was my external monitor that was the main problem. Well, it does add some heat. The temperature raises about 5-6 degrees celcius and the fan speeds up to 2400rpm when idling. This I can live with. However, when connecting my firewire audio interface the heat and fan speed becomes unacceptable. The heat raises about 10 degrees, and the fan speeds up to about 5500rpm. After about half an hour of regular use, like browsing, the temperature goes up even more (as expected) and the fan starts blowing at full speed. And this by just browsing the web. At first I thought it was a driver issue since it's a known problem that the firewire audio driver in Mac OS X uses an unreasonable amount of CPU and causes CPU spikes. This would explain the heat issues I though and traded my Presonus Firebox for a Focusrite Saffire LE which has a fixed drived. Well, the driver issue seems to be cured, now using about 4% of the CPU. However, the heat issue is just as bad as before. I'm sure there are other MacBook owners with firewire audio interfaces here. Do any of you have any heat problems? if not, which interfaces are you using? I'd like to know if my macbook is faulty somehow. Everything is working really well except for the heat/fan issue. And it is a real issue. I cannot stand they whiny fan. It even cuts through music. I thought I would be able to use the MacBook as a desktop computer, but it seems that I will have to get an iMac after all.