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?
We are running our RX5700s with the following settings:
-tt 62 -cclock 1300 -cvddc 800 -mclock 900 -hstats 2 and there are no stability problems. They even run at -cvddc 750 but we want to exclude any hardware crashes when testing, so we keep the voltage slightly higher than necessary. With these settings the GPUs report power about 105W per card. Please note that is crucial to keep the temperatures low, do not use -tt above 65 as this is the edge temperature, and the junction temperatures will be higher. With good airflow, even the first generation RX5700 with the single turbine do not go above 50% fan with the above settings.
Thanks PhoenixMiner for great miner, support and quick response. I copied and pasted your settings, hopefully it runs stable. I didn't have temperature target set before which may be the cause.