I haven't tried it with CS6, since I have no use for DV tapes anymore, but hardware CUDA is completely irrelevant for exporting to tape, since the tape is far too slow to profit from CUDA acceleration. Say you have two hours of DV AVI material to export to tape, that takes two hours. Exporting the same timeline to disk takes only 14 seconds on my system. And that is without CUDA acceleration.
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