Especially Leopard. I'm guessing the speed hit vs. my 9800 isn't worth it for Mac OS 9 support on the Quicksilver, but I'm curious as to if it's a horrible experience or not.
Side question, how noticeable is the difference between a 4200 and a 4600?
Side question, how noticeable is the difference between a 4200 and a 4600?