I've got a 1Ghz FW800 G4, and I'd like to know if anyone could tell me whether it would be worth it to buy this: http://eshop.macsales.com/MyOWC/Upgrades.cfm?model=174&type=Processor&TI=4631&shoupgrds=Show+Upgrades Will there be a noticeable difference? Is 1.8 that much better than 1.6? Why are they so friggin expensive! I don't plan on getting a new mac anytime soon, so would it be worth it in the long run? I also upgraded the video card to a radeon 9800 pro, and from what I've heard/read its performance is somewhat dependent on processor speed. So would this make make my card even awesomer?? Last thing, Panther and Tiger (and I would assume all the 10.xs) says 'Processor upgrade cards are not supported'. Is this exactly what they are talking about? Thanks!