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.
It's easy to get good speeds with one card. The more cards you add, the more strange things happens. My GTX 1660 TI rigs have uptime of several weeks.. Early test of MorePowerTool did not help either.