Question Low GPU Use and Bad FPS

Apr 11, 2019
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Hi Guys!
I'm having some problems with my GPU. I've been trying to play games for a while now, but some of them don't use all the gpu potencial... for instance I played Crysis 3 and the gpu was 100% so I can play with a decent FPS ratio. but as soon as I play a game like Mass Effect (The first one), the GPU stays at 0% to 40%... and never get more than 50 fps. and It's really strange, even League of Legends runs at low fps.

Specs:
Proccesor: AMD FX 8120
GPU: AMD Radeon RX 580 Gaming Gigabyte.
UPC: LNZ 750w
RAM: 8 GB 2400 Mhz

I've played other games like Mechanics Simulator (Really bad optimization and high graphics) And it runs perfectly at 60fps in ultra. I tried a lot of things but nothing worked.