I'm planning to buy a Mac Pro soon (within a week or so), and I'm wondering about the GPU setup. My question: Is there a processing advantage to getting multiple GT120's? I'm running two 30" ACD's so I know I don't need the extra card to support two monitors. But I'm wondering if Aperture, Photoshop, Lightroom, and other GPU intenstive apps would be able to take advantage of having two GPU's? Any info would be appreciated! Fyi - I'm planning on the 8x2.66GHz, 12GB ram, 1TB internal (I use drobo's for storage)...so just wondering what would be optimal for my photographic processing (and some videos with the 5Dmk2 camera).