Besides RAM, what are the main differences between the 12"/14" iBook's ATI Radeon 9200 and the 12" Powerbook's NVidia Geforce FX Go 5200? Anything in Tiger that would show a difference. I went to the mfg's websites and both have their own branding for different terms. I know that the NVidia is DX9 compliant and the ATI is 8.1 compatiable. Which GPU is faster, better?