That BIOS/OpenFirmware thing, you've got it a _bit_ wrong, though. GPUs, like other things, just have a flash-firmware (often, at least) that can be flashed with newer versions - or, thankfully, with Mac/PC versions, as you like. ATi has started to hinder this, though. However, just wanted to point out that you don't need a different chip soldered. It's a software problem.