Well, I've received and installed my Dr. Thermal HSF onto my Athlon XP 1700+.
The good news: my system seems very stable and isn't giving me any problems.
The bad news: the fan is far from silent.
Maybe I've just been away from building custom rigs for too long, but the noise my system is putting out drives me nuts. I checked back on all the reviews and they all say that this fan is 'quiet', but I'm having a hard time enjoying any of my music, etc. I don't think I've got a defective unit, but I do think that 'quiet' in the Athlon cooling world is different than on the rest of the planet. I shutter to think of the noise that the 'loud' fans are putting out.
Now, I haven't run my powersupply without running the fan, so there's a chance that a great deal of the noise is coming from the powersupply's fan (only two fans I have running), but I'm pretty sure most of the noise is due to the Dr. Thermal on the CPU. I'll do some tests and get back if I find out the powersupply's the culprit and I need to have my hearing examined, but whatever it is, I'm definetly willing to spend some cash to make this computer shut up. What's the point of having a good sound card and killer speakers if you can't hear anything over the hum?