I'm upgrading from 2 GTX 460's to 2 GTX 570's and am thinking about using one of the 460's as a dedicated PhysX card. Is this pretty simple to do? Is it just a setting in the Nvidia control panel? And, is it worth it? Will I see noticeable gains in performance? I'm using a 30" monitor @ 2560x1600, and the games I'm playing right now are FFXIV, Dragon Age II, and BF:BC2. I have my system specs listed in my profile. Thanks!