back when i was testing out Donald's NV tools and the CUDA renderer within the CUDA toolkit some many moons ago,
I found that the vp chip has a constant fps rate for all material and for all resolution sizes...
so decoding a 720x480 mpeg2 clip will have the same decoding speed as a 1920x1088 h264 clip does, despite the large differences these would have on a cpu.
i usually saw the render rate just under 50 fps on my VP2 card, so it coincides with your findings of 49 fps being the maximum.
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