From what I can see at work: scientists try to use CUDA (and other GPU based calculations), it is "modern". But the result is normally disappointing, either the cards are overheated or the results are incorrect. GPU was not build to deliver precise accurate results, who will notice that left rear weal on some car you see in 200 meters is drown incorrectly for 1/80 of second? Game "profis" really are, in Internet you can find many comparisons between reference picture (CPU generated) and accelerated (GPU generated) with discussion about "artifacts" (the difference between them). For video it is almost the same, if some pixel was rendered wrong, no one notice that. But are you ready to accept such "artifacts" in your music?
I have also seen many notebooks burned by GPU cards under continuous full load.
In case you want hardware accelerated audio processing, there are specialized solutions. For example
http://www.uaudio.com/uad-plug-ins/uad-2-satellite.html