I was just surfing my local craig's list and found a posting for a Mac edition Radeon 7000 for $10. My questions are, is this compatible with the G4 in my sig and would it be a worthwhile upgrade? My G4 currently still has the stock Rage video card and I do find it a little lacking when it comes to video playback. Would the small bump help in that regard? Anybody with knowledge or has used this model have any thoughts? Thanks.