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Oops sorry GTX965M... DLL thing doesn't matter for this discussion. PD14 is twice as SLOW than PD13 producing to MP4. Have updated the nVidia drivers several times (353.62, 355.60, 355.82). Even installed WIn10 and now preview 10532.
NVENC doesn't seem to be 'faster' than CUDA when transcoding .m2ts to MP4 in my case.
Sorry, I'm failing to understand what you really have or are comparing. To my knowledge, with a GTX9xxx GPU, current version of PD13 or PD14, and recent Nvidia drivers one can't even get the old CUDA encoder to function with the dll file replacement. At least it won't work for me on a GTX960, GTX970 or GTX980, however, I see little value in trying so didn’t spend a lot of time on this. Threads have been posted by others too. So how are you comparing NVENC and CUDA on GTX965M?
Laptops can be very strange depending on manufacture and iGPU vs discrete GPU operation and switching. I assume you have monitored the GTX965M load and it's truly being utilized for your MP4 producing comparison? Can you be a little more specific on exact MP4 settings so that maybe one can try and repeat. PD supports a MP4 container for H.264, H.265, XAVC S with many different profiles, some of which don't support hardware encoding with Nvidia so exact settings would be helpful to try and replicate, a pic of entire produce screen ideal.
For me, m2ts to H.264 MP4 1920x1080/30p (16Mbps) was 4.33 faster than real time for both PD13 and PD14, identical.
Jeff