NVENC, Boost, and video encoding questions.

I am trying to optimize our K80 for multiple video encoding schemes, but it seems like we are not getting the performance out of the K80 that we should.

  1. Why does the ‘AutoBoost’ only goto a maximum of 562MHz on the pclk?
  2. Why does the encoder utilization not goto 100% whenever it is being used? (I have seen several encodes where it maxes out at 80% and it still takes 20minutes to process a video.)
  3. When testing the same file; we found that a 780-Ti was able to process a video at 346fps, and the K80 was only able to achieve 197fps.

Would we be further ahead to downgrade our driver and switch to CUDA processing?