The ATI HD 2600 XT does not perform as well as either the Nvidia Geforce 8800 GT, 512 MB or ATI RADEON X1900XT

The ATI RADEON X1900XT performs slightly better than Nvidia Geforce 8800 GT, 512 overall in a 2008 MacPro (current model).

Macs purchased from apple can be spec'd with any of the 3 above. I would recommend the ATI RADEON X1900XT


Also check out post: http://chaldee1.gotadsl.co.uk/~richa...ead.php?t=1466

Simon