Yesterday I picked up a 650 duron for $39 that was a "new pull" to play with on my Abit kt7-raid MB.
Use the permatex rear window defogger goop to unlock- seems to work.
Currently running at 900 mgz at 1.625 voltage.
Temps range from 98 to 103 F with an Alpha 6035 cooler.
BTW - my power supply is a Sparkle 235 watt (only) unit. I know, need 300 watts. Well i've got it in the closet - but hey, the sparkle is working great.
This cheapy little duron has met and exceeded my overclocking expectations ! 900 mgz for $39 - too bad i already had bought a duron 800- oh well, live and overclock!