Hey guys, so I was gonna run SLi but one of my GTX 460s is broken, so I am returning that and getting a GTX 660. I was planning on running the GTX 660 as a main GPU while the GTX 460 runs all of my Physx. I don't think that I need a SLi bridge to do that, but would I need it to have the cards communicate with each other or something? Also, I heard Physx can be used in BF3, how do I turn it on? I couldn't find the setting.