How to Improve performance on Speedgrade?

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i'm unable achieve realtime playback 1920x1080 @ 29.97fps dpx sequence exported premiere pro on speedgrade 6.0.2.  find hard believe concidering how beefy of pc running on:

 

  • windows 7 64bit
  • core i7 3970k @ 4.5ghz
  • intel z77 motherboard.
  • 16gb ram
  • geforce gtx 680 2gb.
  • project files located on seperate ssd (no os or else on it)
  • samsung 830 256gb ssd  connected via sata 6gbps port on intel conctoller. (aja system test shows 400mb write , 500mb read 1920x1080 10bit test) 

 

when playing project effects on it, there stuttering, , 2 icons turn red.  disk, , monitor.  if stop playback, , rewind playhead software has cached frames memory, playback full speed memory cached section.

 

cpu usage less 15% during playback of uncached section.  that's not bottleneck.

 

i've made sure histogram doesn't render while playing back.  found did hurt performance.

 

with drive pushes 500 megabytes per second, shouldnt ssd setup able keep looks 240megabyte per second dpx stream (8megabyte*30)?  there settings can change in speedgrade total real-time playback assuming can read media disk fast enough?



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