I have a desktop with a Nvidia GeForce 210 1GB. I am going to buy an Nvidia GeForce GT 630 2GB. Is there a chance to run both of these video cards at he same time? I think none of these cards support SLI but I do think of it both of them have PhysX.
PhysX is a physics rendering engine for nVidia video cards. It has nothing to do with SLI.
However, if you want to use multiple monitors, yes, you can have multiple video cards to add more monitors.