i just connected my old powermac g4 to my 32" samsung lcd hdtv 720P. picture looks really good but ive been told i should upgrade my video card. i have the original video card and in the display setting it is set to 1360 X 768. from what ive been able to find out on the internet 1360 X 768 is the resolution of my 720P hdtv. therefore how would upgrading my video card help me ?