It runs fine on my 1998 G3. I'm a bit pressed for HD space when mobile but it runs fine and I'm debating whether or not to upgrade the HD. I was just going to sell it but when I installed X and saw how well it ran, well I rethought my plan. My wife always steals the TiBook ("It's so cool..."). Instead of buying a new one for me, maybe I'll keep my old buddy.