oh, you will know long before your chip is dying (as in, frying to death). If you choose a speed/vcore that is too high, you will experience instability (as in, crashes). Find the highest speed with a reasonable vcore/temp, and run SETI and foldign@home and rc5 and whatever else you can (internet, winamp, icq, etc) and see if it can go for a week. If it does, you're fine. If it doesn't, try either a slightly higher vcore, or a slightly slower speed.