For an NVIDIA card ( regarding any series ) 2D surround is what you can get for multiple monitors. Whether it may be 200,400,500 series, they can't handle multiple monitors.
A single NVIDIA card can't handle multiple ( more specifically 3 monitors ) at once. Only SLI can. Whereas if you've got AMD/ATi card, you can handle multiple ( more than 3 ) monitors simultaneously.
Also, it's not RAM, it's VRAM for the memory dedicated to a card.