yes, it's probably not going any higher because your hardware is not capable of more.
if you wanted your experience to feel smoother though, you'd probably be better served by artificially capping it to 120 or something you can achieve the majority of the time. it will feel smoother.
if you're allowing temperatures to be automatically managed, capping to a more consistent number would also reduce heat generation, and therefore system noise.
besides, ofcourse you can have silly high (useless at that point) numbers in Counter Strike - it's made to run on Potatoes, very, very little visuals wise to make sure that even people with 10 year old computers could still play competitively.