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Nvidia 580+460 Physx

Actually even with a framerate drop having a dedicated card for physics and another card for rendering will produce smoother, more playable, results (unless the framerate drop is really massive).
 
Don't be silly, a 580 dealing with rendering and a 460 dealing with physx has to be faster than trying to have a 580 dealing with both, I honestly can't think of a single scenario where that could change. Well unless I'm missing something massive D:
 
Not easy to explain concisely. Its based on an analysis of the frametime of each rendered frame and those frames around it to see when the percieved framerate is significantly (and for most people noticeably) different to the displayed framerate resulting in either microstutter or big enough to cause actual hitches/stalls in rendering.

The number on its own is somewhat meaningless - something I need to work on - but taken in context of multiple benchmarks from the same test run with the same settings (but different hardware) its a good indication of how smooth they are in comparision. i.e. the 2nd one would have on average 6x as noticeable stutter over the same period compared to the 1st setup. As a rule of thumb anything under 5 for stutter is ideal but anything upto 20 isn't a big problem. Once you get above 20 its going to be less than smooth.
 
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