There are any CS players who love to play the game on their old monitor because they do not want to change the settings. These players also do not use the clear 1080p HD, as they have about the low quality of screen but just because they are handy about that.
Another thing that can consider by a player while playing CSGO is the aspect ratio of the screen. The most common aspect ratio that people use is 16:9, and if you have bought a new monitor, you should go with the 16:10 because that may help you with the settings, and you will get handy.
The next and the old school type of ratio is 4:3, and if you get this, it will stretch your screen.
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check his settings on proconfig.net