I just replaced a 9600GT with a brand new GTX260, the machine ran Dual 9600GSO's before the 9600GT. It is folding fine, with an exception. It's PPD seem to jump around a lot. I know the PPD vary from WU to WU, but I'm talking huge jumps. My GTX285 gets a pretty constant 8500-9000 PPD based on what WU it is working on. I expected the GTX260 to get similar, but slightly less, numbers. However, after running it over the weekend, and checking on it with FAHmon, it is getting very inconsistant results. I'll check on it, and it will be in the 8500 PPD range, but then I'll check again a few hours later on a different WU, and it is down in the 4800 PPD range! I can't figure out why it runs every other WU so much slower. I even had the GTX285 and GTX260 running 787 WU's at the same exact time, and the GTX285 was going at 8400 PPD, but the GTX260 was running at 4800 PPD... Now they are both running 787 WUs and the GTX285 is reporting 8400 PPD and the GTX260 is reporting a more proper 8200 PPD. Any idea's why I'm seeing the GTX260 having drops in PPD?