I have a 20" iMac, G4, superdrive, OSX, 768 ram, 80 gigs, etc... The current (stock) video card is the NVIDIA GeForce FX 5200 Ultra w/ 64mb of DDR SDRAM. I am wondering if I can upgrade the video card. The only games I play on here are CC:G and Civ 3. I just think that if I uped the video card, the games would run a bit smoother (not that bad, now), and I'd be able to scroll through pdf's with large pictures files in them. Has anyone upgraded their iMac? Thanks!!!