High End PC running CSGO at only 100fps with fans going really fast

[foleyrobbie0]

So I recently built a computer. When I first play CSGO on it. It ran at 280fps plus it was fine. Then a few days later it runs at <100fps with the fans going so fast. Like I would never hear the fans go that fast in anything. For some more context my computer can run a very new game RE2 remastered at like 60fps+ on highest settings.

Specs
Ryzen 2600x
Vega 56
16GB Corsair Ram 2400mhz
gigabyte b450m d3sh
corsair cx850m PSU
1tb 7200rpm HD

All help would be appreciated

 

[bniknafs9]

CSGO is like black ops it gets your resources working for no good reason