I cannot believe how much heat my mac pro puts out. My home office (about 12 x 12 foot room) right now is 82 degrees with the door open when the rest of the house is about 75. It wasn't as bad when I got it, but after upgrading memory it's gotten horrible. I have it under my desk and it literally feels like a space heater. It really got bad after I added 2 x 2gb chips - have a total of 8GB of ram at this point. Activity monitor shows basically no CPU (<1%). I wish there was a way to shut the ram OFF when not needed to save the heat. I'm scared to see what it's done to my electric bill as well. I thought Al Gore was on the board at apple? Anyone else have this experience? If you only have base ram please don't bother to comment as I didn't notice this problem until I put larger amounts in.