One thing I've always admired about madshi's work is that madVR will improve rendering quality no matter what graphics hardware you have. I have a 9" tablet that runs Win 8.1 on an Atom chip, and at default settings madVR performs just fine.
A 1070 card upscaling to a 4K display will produce obvious PQ improvements with any level of NGU. The question then becomes, as always, is it worth spending the bucks on a new graphics card for the amount of improvement you're going to get beyond that. Only your eyes (and your wallet) can answer that one.
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