A:AnswerIt has the newest version of Windows 10 installed. It does overheat as far as I can tell, I run the new COD at full settings without issues and yeah you should be fine running csgo at high res.
A:AnswerIf you want maximum performance the fans do get quite loud. However there is a silent mode that is absolutely silent if you wanted to use it to watch a movie or some other low-intensity task.
I have only online for short time but have not noticed it getting hot at all even when running a demanding game.
Beware that a laptop like this with a powerful processor and full fat GPU will have very limited battery life