PC doesn't go 100% on cs:go

Feb 10, 2019
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Hello, sorry for my bad english and ignorance (first time posting on here).
I've recently bought a rx 590 to pair up with my i7-3770k to play games, but i was kinda disappointed when i saw the performance on cs:go. The game runs at 150-200fps (which is a lot, i know, but everybody who knows cs will always tell you that 300 fps is minimum) but neither my cpu or gpu runs at 100%. I've seen YouTube videos of people getting 300 fps on cs go with my same cpu and even a worst gpu than mine. Can someone help?