What would be a better graphics card for a mac pro Desktop? ATI Radeon X1900 XT 512MB (2 x dual-link DVI) [Add $249] vs NVIDIA Quadro FX 4500 512MB, Stereo 3D (2 x dual-link DVI) [Add $1649] I play WoW and soon many more games on my Mac Pro and i would like to know which is better. Anything that will push the frames rate up would help. I habe the ATI in my desktop currently but i might upgrade to the Quadro if it is better. Thanks in advance.