[Jim Prisby] "Since the GTX680 starts at $500 I would rather save money by purchasing the GTX570 or GTX580 if that's true."
If you are willing to spend that much you might want to soend a bit more and get an NVIDIA Quadro 4000 card instead of a game card. It may prove to be more stable with professional video applications (unless you need it to play games too).
~jr
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