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"experiencing a bottleneck while editing"
are you referring to previews while you edit or rendering?
If you are referring to rendering, that's a function of your main CPU, the i5, and how you use uour drives to prevent bottlenecks. i.e. the editing program, source files and destination on seperate drives.
if you are talking about previews, that's the video card. You might want to go back to a single monitor for previews instead of dual view. Or strap on another video card for the other monitor (that will be a function of card space and power supply ability in the computer chassis, m/b).