CPU usage is high?

My PC:

CPU: AMD Ryzen 7 2700X

MOBO: X470 Gaming Plus

GPU: MSI Geforce RTX 2080 Gaming X Trio

Ram: G.Skill Trident Z RGB 3600 (I wasn't able to OC to 3600 but i got it to 3333 Mhz)

When I play GTA 5 and I check task manager and it said that CPU usage is 100% and GPU usuage is 0% (setting for graphic are very high). Similar thing happen when i play Call of duty modern warfare and my CPU usage is around 60% but my GPU is ~0-5% usage.

Not sure if it is something have to do with the RAM please help!

Update: So I fixed it by unpack my cores