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A 710 would be much slower than Intel HD Graphics 530.
Integrated is between a GT 730 and 740.
http://www.tomshardware.com/reviews/gpu-hierarchy,4388.html
will a low profile 710 offer much improvement over onbaord Intel graphics from an i3 skylake?
It's not for gaming, just office and web stuff, dual monitor setup
Ouch, so it would actually be detrimental to put a 710 in a build with a 6100 CPU? Better to just use mobo?
Yep.
Especially as support for hardware decoding etc. will be superior.