But I think you had trouble finding them so let's get to the Video RAM. Some games can use all that. Since there's no game listed, I'll skip to the high settings issue.

One of the best tricks in gaming is to not run at max settings. I find newer gamers head to max settings and later they learn to pull back a notch here and there. That said, let's read about the notebookcheck 860m findings.
http://www.notebookcheck.net/NVIDIA-GeForce-GTX-860M.107794.0.html finds mostly green on high, not a lot of green in Ultra but still a fair showing for a laptop.