100+ 3D grfx coming my way...Would like them to play in realtime without rendering.
Are these grafix full composites or layovers with alpha channels? I would have him send a short test render with your exact sequence settings. If your 3D grafix have accompanying alpha channels for compositing over footage, you will not be able to get away with viewing realtime without rendering. Otherwise, as long as the 3d renders (full composites) match your sequence settings they will play in realtime.
...just as long as they match your sequence settings...they will play. I would always run a short test render (especially if there are many renders coming in).