[Moved to Hardware forum.]
While CC can indeed use the GPU power from two GTX 780s, you would likely see a huge gain in DVD render speed (outputting from PPro, not necessarily from AME), but not necessarily much else.
You might find the following thread interesting where going from one GTX Titan to two almost doubled the DVD render speed as measured by the PPBM6 benchmark.
Nothing else however was helped in any noticeable way (timeline playback, blu-ray renders, etc.). The 780 is a strong card too, so I would expect similar results. You can plot your GPU % utilization with your CS6 setup and probably find that it is rarely max'd out and indicating that you are GPU bound.
BTW, SLI does not need to be enabled to help CC. I don't think earlier versions of PPro played well with SLI however another user here did report that CC worked OK with SLI enabled. And, it was neither faster or slower than running with the same two cards installed but without SLI enabled.
Jim, I fully agree that our PPBM6 benchmark does show immense gains when you encode AVCHD to MPEG DVD, but I would also guess that it would show similar gains going from AVCHD with down-resolution to H.264. Guess I will have to try that.
Message was edited by: Bill Gehrke
You got me past the inquisitive stage, I took my own challenge and ran the PPBM6 MPEG2-DVD timeline that we are using in Premiere Pro 7.0.1 (current CC version) which in my lopsided non-BFTB configuration (i7-2600K not overclocked with the current GPU which happens to be an GTX 780). The scores with MPEG2-DVD encoding versus H.264 Youtube HD 720p 23.976 fps with and without GPU acceleration are below:
With Without MPE Gain
MPEG2-DVD 24 911 38
H.264 Youtube 118 1896 16
While it is not as spectacular MPE gain on H.264 it still is one heck of an improvement on a timeline that is loaded with MPE accelerated effects and features. The whole timeline has a red indication without the GPU and yellow when it is GPU accelerated.