A:AnswerThere -may- be an m.2 PCIe slot on this motherboard, but it is unconfirmed. I would actually recommend just replacing the slow 5400rpm on this with a new SSD.
A:AnswerNo, this is a cheaper Best Buy model. It does not include those extras. Also, it does not include Asus's special 'international warranty' that includes accidental damage protection, unfortunately.
A:AnswerYes it can but the problem is that 4GB is soldered onto the motherboard and is not removable. There is one RAM slot that currently has 4GB of RAM on it. So really the most you can do is swap out the 4GB stick with an 8GB stick to give you 12GB RAM. Unless they make 12GB sticks for laptops which i hven't seen.
A:AnswerHaven't tried CS:GO, but this has been able to run other games of mine (Skyrim, GTA IV, Saints Row 4, ect) on high settings, so I"d say it's pretty good for gaming. :)