OMG. My G4 SAWTOOTH was 450MHz PC100 SDRAM with 100MHz Bus, and now it's 533MHz with PC133 SDRAM and 133MHz bus! It's acting VERY stable, and I had NO probems with it after running it in OS 9 with Unreal Tournament 2000 Demo. I built-in a small, but powerful fan on the side of the heat sync for cooling, and it seems to be working. Of course most of you know how I clocked it up. I know it isn't TOO mucch of a speed increase, but so what? I'm happy! But it's supposed to be 598MHz!!! But it wouldn't start-up from what I heard. Can I put a G4 867MHz or faster G4 processor without it messing up the motherboard or clock decrease? Yeah, I know I need different cooling heat syncs or fans, and yes, I know that Quicksilver/Digital Audio processors WILL NOT FIT, so I'll find a MDD CPU or Sonnet.