Asrock Challenger RX 5700 (Non-XT) - I got it 24/7 stable with the following settings in Phoenix mining ETH. I also share some tips for those like myself who experience AMD drivers crashing and resetting their clocks in Windows. Check it out below.

Config:   0.850 vcore | 1350 core | 1840 Mem | 56.97 Mhs | 118 watts

I can get to 58 Mhs + but it is not 24/7 stable with current drivers, I also modified my GPU in past content released on my channel.

Improved ETH Hashrate | Red Bios Editor Mem Mod
https://youtu.be/LwGUJjQgj38

Red Bios Editor - More Power Tool (Igor's Lab):
https://www.igorslab.de/red-bios-editor-bios-eintraege-anpassen-optimieren-und-noch-stabiler-uebertakten-navi-unlimited/

Force flash your GPU vbios, but MAKE SURE to always back up your original.
Commands to run:

amdvbflash -unlockrom 0

amdvbflash -p -f 0 NAMEOFYOURBIOS.rom

Updated - MorePowerTool - 1.2
https://www.igorslab.de/morepowertool-amd-radeon-rx-5700-und-rx-5700-xt-tweaking-und-uebertaktungssoftware/2/