Question GPU low usage (with pretty decent cpu)

Mar 31, 2020
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Hello guys, recently i noticed my pc performance is underwhelming,
GPU- gtx 1070
CPU- I7 4790
1X8 GB ram 1600 mhz
when i played CS:GO my gpu usage were on 13-14% (max 20%) and my fps were on 150~ even lower (cpu usage were 66%~)
I played PUBG and my gpu usage were on 40% (cpu usage 80-90)
AC-ODYSSEY Gpu 60% (CPU 100% constant).
and much more games when my gpu were on 30% usage when my fps were pretty lame.
things ive done:
reinstall windows, update all latest drivers, power managment max performance, nvidia cp - max performance.
my temps are okay - gpu 50-55, cpu 65~ (all while gaming)
im sitting on this problem for like 2-3 full days with no success :/.