New
#11
As I understand it, Game Mode is not for most "gaming computers". It is a feature for very low end computers to enable them to play a game they could not otherwise play. Microsoft seems to have made a concerted effort for the gaming community with the game mode and Xbox things they have included. I would assume that if they detect a problem that can be reproduced, they would issue an update to correct it.
Your artifacting sounds more like a graphics card/graphics driver problem. While I would think it is possible, I don't recall ever seeing a monitor causing them.