Hola, I've always felt my Mac Pro ran a bit hot and so recently, I replaced a video card (7300) with a 1900xt (flashed of course). I have two video cards,, a 1900xt flashed with upgraded fan and a 3870 (Mac based).. slot 1 and 4 are being used. I have SMC Fan Control running-- 1700rpm exhaust, 1600 cpu, 600 power supply (doesn't seem to want to go higher), and 1600 HD/Expansion.. Attached is a pic of my temperatures.. I'll post temps in both C and F. I would love comparisons with others that have a Mac Pro 1,1,,, thanks!!!