I just installed a Radeon 8500 AGP card in my Gigabit G4 with a 1Ghz Sonnet Encore upgrade. The speed increase has been quite impressive. However, I have had a problem with the system locking up when the screen saver is activated. I am running Panther and using the "Cosmos" screen saver that comes with it. I ended up disabling the screen saver and it works fine now. I'm just wondering if anybody else has had a similar experience and how they might have solved the problem. Thanks-- Kevin