I'm using this setup since couple of months (i5 4460 + rx 570 4gb oc + 8gb ram 1333mhz ) and im having pretty low fps comparing to my old setup which was clearly worse (R9270x)! During the competitive game fps jumps down between 120 and 200, i know it is actually pretty high but since I have 144hz monitor any fps below 144 obviously shutters! Is there anything i can do to increase that?
I've tried to reinstall CS:GO; Update the drivers; Change the videos Settings (V-sync off), etc
your cpu is too weak for a 144 hz monitor - you could try lowering your resolution and other settings.