I have 2 RX5700, Windows 10, AMD 19.9.1 drivers and Phoenix 4.6b... I don't know how people are getting them to run at 100W, I can't get it to run reliably even at 130W. When I try to undervolt to anything bellow 1V, after few hours hashrate drops to 0.00 and needs system reboot.
Anyone else experiencing the same?