I have a 2GHz Dual G5 with the standard Radeon 9600 card in it (ADC & DVI). If I want to upgrade to a better graphics card do I need to make sure I get one from a mac specialist? Or could I - for example - buy one cheap off the internet (say the 9800) and install it in the machine? Given that the new screens are now running off DVI is there anything different between a card like this for a mac and the same one for a PC?? As long as OSX drivers exist for the card it should be ok shouldn't it??