I don't think it's the power supply, it was only happening with games. I was running Quicktime movies at fullscreen size with no problems, as well as viewing images in millions of colors. I think it's just certain applications that accessed the screen in certain ways, which I believe to be a software issue. So, this is definitely a big improvement. Actually, I can't observe a cpu hit at all, it's completely in the background.
Quake runs smoothly at the largest video setting with the most details, etc.
I have now run the Quakedemo's timedemo feature and I get 13.7 fps at 512x342 pixels doubled, but not skipped. On timedemo 2 with the same settings, I get 16.7fps. Things launch so damn fast. I run the RC5 challenge program. I haven't had any conflicts or freezes with any of my internal or external devices.