Question Low performance on high end PC

Oct 13, 2018
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So, last month I won on a giveaway a new PC and my experience with games are far from what I expected :( I started playing old games that I couldn't with my old rig like AC: Unity, AC: Syndicate or The Witcher 3 and with all of them I'm experiencing low performance, very far from being "smoothy" as I imagined with this PC.

I used MSI Afterburner to see GPU Usage (\~60%), FPS (35-45) and GPU Temps (\~60C) when playing AC: Syndicate on ULTRA at 1080p. It seems GPU Usage isn't at max and I concluded that it's the principal problem of low performance (FPS) on games. Am i wrong?

Is it normal that GPU usage percentage on the current rig and that game? What can be the problem? Is there anything I'm missing? My previous rig was Intel / Nvidia so there may be chances of missing setup for AMD.

PS: Yesterday I updated GPU drivers with AMD Radeon software (Radeon™ Software Adrenalin 2019 Edition 19.3.1).

PC:
Ryzen 7 2700x
RX VEGA 56
16 GB RAM
Arous 470x Gaming 5 Wifi