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Zwift say the Intel HD 4000 and AMD R meet minimum spec.
See also this Zwift forum thread:
one user says he has the Intel i5-6500 Skylake with HD 530 graphics, works in High Quality mode, doesn't say what FPS he achieves.
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The cheaper i3 NUC has "Intel HD Graphics 520"
This seems to suggest 520 beats 4000:
http://www.game-debate.com/gpu/index.php?gid=3285&gid2=864&compare=intel-hd-graphics-520-mobile-vs-intel-hd-graphics-4000-mobile
How is Intel's onboard GPU for Zwift's 3D? Traininerroad doesn't have any 3D I don't think. Computrainer software does 3D.