and another with one RX5700XT and this one will only mine consistently if I use Xintensity 448 or below.
Above 448, it ends up crashing and upon restarting, the Dag is reported corrupted, and it enters a miner restart loop.
The AMD intensity needs to be 1/4th of the nvidia intensity. so 448 is the same as 1792.
To reduce dag validation error you can try --dagintensity 1 , or with a low number. This will slow down the dag memory buffer creation, but is stable on higher clocks