Soldato
Just upgraded my HIS HD 7950 to a Powercolor Red Dragon 5700 XT. It's bottlenecked by my i5 3570k (which I'll be upgrading to a 3700x) but I'm really impressed for now. It's driving my Samsung SJ55W 34" ultrawide and I'm extremely pleased with it.
I hope you used latest DDU to wipe out the drivers, installed 19.12.2/3 and you aren't using MSI AB yes?