A:AnswerI own this model and it is 1920x1080. I couldn’t tell you if Best Buy has the exclusive on this or not. If you are torn between the two versions, consider the graphics card you are using. You would need a sophisticated system to handle the 2560x1440. Anything higher than 1920x1080 would be a waste on an entry level system. In this case bigger is not better and less is more. The quality will impress you and the lower price point is a bonus.
A:AnswerDepending on the game, your RTX 2070 should be able to reach 144 FPS. The monitor itself will run at 144Hz regardless of the FPS once the correct refresh rate is enabled.
A:AnswerYes. If you have your keyboard and mouse plugged into your laptop, and get a hdmi mini to hdmi inverter you will be able to use it as a main monitor and you are even capable of making your laptop a second monitor aswell.