I'm an avid user of multiple monitors and have been contemplating an upgrade to a couple of 4k monitors. However I'm not sure how to interpret my video card specs or the specs of other cards I might have to get. Most cards specify the maximum resolution, but it isn't readily apparent whether this is per display or an overall maximum renderable area.
For example I have a card based on the GTX 650 Ti chipset that claims to be able to drive 3840x2160 at 30Hz. This is the size and speed of the monitor I was looking at—bit while my card has four outputs, somehow I wonder if it is up for driving 2ea 4k displays. Would that spec resolution be per-display or an overall total across multiple displays?