As long as the room it's in is very well air conditioned, condenstation won't really be much of a problem. But I do know a 127watt Peltier would definately condenstate on an Athlon XP, there is just no questioning that. What kind of temperatures do you get on your SLK-800? I'm sure they can't be that bad, if it's anything near the 100 mark, I wouldn't want to go with a peltier.