I just did the pencil trick with the L1 bridges on my Duron 650, it worked the first try. I went to 800 to test first on my K7T pro2A, works great, temp is lower than at 650, because I scraped off the pad, and used RadioShack white paste. 33c not too bad, 1.75 volts. Using a CoolerMaster fan, and my old 235watt ps is running good too, sytem monitor shows 5.0v 3.33v and 11.9 for the 12v supplies.