Want to get the new imac 20"but can its graphics card be upgraded and how good is it ati 2600 h

i know that the mac can run parallels and boot camp thus it can run windows game correct but i want to know if it's graphics card can handle games like halo 3 battle for middle earth fable i dint need them to run at full graphics but at middle graphics with no lag. and if it cant can the graphics card be upgraded by me or by sending it to apple inorder to replace (upgrade the card) please not to be insulting but i wouldlike exsperienced apple users to answer this question

Want to get the new imac 20"but can its graphics card be upgraded and how good is it ati 2600 hd?

Halo 3 isn't out for the PC (Vista) but Halo 2 is and is a 2005 game with 512x512 textures instead of 256x256 textures on the original Xbox.

The ATI HD 2600 is a great entry level card and it should be able to play all those games at full graphics without a lot of post rendering like AA and AF (the 20" has 1680x1050 native res I Believe).

The existing graphics cards is a PCI-e card and therefore replaceable, but not all high end 3D gaming cards are compatible with Mac and may not have drivers for it (even though the drivers are available for windows).

If the card you want to upgrade is supported in OS X 10.x then you can upgrade it yourself (really easy to do, just unplug the old and plug the new one in and install the drivers). To date, Nvidia's flagship 8800 GTX is NOT supported in OS X and won't boot into OS X.

As far as I know , the HD 2600 Pro is the best performing card for the Mac, but it will be able to play the games you listed smoothly. You can buy an ATI X1900XT for the Mac, but it's a DirectX 9 card (is supported by OS X don't waste your money), just wait for something better to come out.