Now that an Nvidia card can be used for Physx along side ATI Cards in X-Fire, what should you look for in a card that will be used only for the Physx application? Does it matter? I'm not saying I'm buying one but if I wanted to try it what would I look at? The new Batman game promotes Physx and that's why I'm interested. I'm thinking Physx doesn't need to be high end right? Do some Nvidia cards run Physx better than others?