I would think that the MacPro isn't so much about more monitors, though it can do that, but about sheer horsepower. Running Photoshop filters, rendering. Stuff

I would think that the MacPro isn't so much about more monitors, though it can do that, but about sheer horsepower. Running Photoshop filters, rendering. Stuff that needs 12 cores isn't going to run so well on an iMac.