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So when it come to upgrades for my PowerBook G4 I really have no idea what I'm doing. I recently upgraded to 2GB of memory and feel that the next significant upgrade would be my video card. I believe I am currently using a ATI Mobility Radeon 9700 and it says in my computer info screen it is 64MB. I talked to someone at the mac store and they said there was no upgrade for this and I was hoping he was wrong. If anyone knows a possible video card upgrade for a Powerbook G4 15" 1.5GHZ Laptop please help me out!