A friend of mine has got a XP 1.9+. He was also worried about his temperature getting above 50 degrees Celcius. He has got a powerfull hsf, though (actually, and you can call me dumb for it, I guess, what does that stand for?), a Suncore Copperstorm, if anybody cares. He did not use any case fans, so that could be the reaon. What did he do? He just drilled a hole in his case right nex to the cooler, so the air flows right out of the case. His temperature lowered by 6 degrees, now running comfortably at +- 45 degrees, getting close to 50 when overclocking his darling to 1680 MHz (140 MHz FSB). Maybe not an elegant solution (and most of all, far from quite) but it does work.
In comparison: Another friend of mine bought a Celeron Tualatin-system. Uses the stock hsf from Intel. Overclocks from 1200 MHz to close to 1400 MHz. Temperature remains stable (no difference between OC'ed system and normal one!) at 41 degrees. No additional case cooling, just the psu-ventilator. Amd definitely needs to get to .13 micron and cool things down a little bit! The XP 2100+ dissipates more than 70 Watt! I hope that problem is solved in the Tbred ...
Greetz,
Bikeman
<i>Then again, that's just my opinion</i>