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Real time raytracing has been done for awhile ... in fact I remember seeing a scene with 3 spheres moving over a plane that was running in real time on a Pentium 3 1GHz when I was in college Ray-tracking is one of those problems which is easily distributed and, if someone developed the correct hardware for it, you could have pretty advanced games being ray-traced today. Hypothetically speaking, you should be able to take 4 quad core CPUs and put them on a PCIe board with some memory ... you sould then be able to take 4 of these cards and attach them to a motherboard to create a "Ray-Tracing" System. With that done, I wouldn't be surprised if you could get a PC game from 1999 to 2000 to run on a system like this being rended using ray-tracing.