I have 4670k@4.6, rx480 and I get 250-350 fps - low settings(you don ' t need anything at high except shadows). The GPU is not the limiting component - the CPU is. My GPU gets 70% load, while the CPU is at 100%, and there is barely any difference at 1080p and 1440p. If CS GO is your priority, get the fastest CPU you can afford, and a low-mid tier graphics card.