How Warm Are The Mac Pros?

I've got a Quad G5 and this is my primary complaint about the machine... how the room where I've got it is quite noticeably warmer than even the immediate hallway...

I think i noticed this when I first turned on my Mac Pro. I think it has something to do with the power supply. I dont' know what the noise is though. I don't hear it anymore, but that is probably because I only hear my APC UPS click on when the Mac Pro turns on / wakes up.
Kimo

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