Question My PC under performing (Bottleneck?)

Apr 2, 2019
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Hello, this is my budget PC specs:
Procie: Intel Pentium G5400 Gold
RAM: 8GB DDR4 (Single channel ram), later upgrade this
VGA: RTX 2060 6GB
Monitor: FHD TV 60HZ
I have problem when i play games like DOTA 2& PUBG because i got low fps:
  • DOTA 2: AROUND 80 FPS (MAXED SETTING)
  • PUBG: AROUND 60-100 FPS, sometimes drop to 40-50. (ULTRA),
even when i try reduce the setting. i still got the same FPS. But when i playing apex i got good FPS like 90-120 FPS (MAXED SETTING). I try to using MSI After Burner to see whats the problem and i got GPU USAGE: 40%, but CPU USAGE: 90% when i play DOTA 2 or PUBG, but if i play Apex my GPU Usage more that my CPU Usage. Is this bottleneck? or what should i do to fix this?
Help me, Thank you.