I'm getting DAG verification failed, invalid 100% on rx580 8gb mining ethereum with NBminer, any solution to this?
You may have problems with your graphics card drivers. Older drivers did not support a Dag file larger than 4 GB.
Update AMD drivers. I have drivers from October or November 2020.
Or see the versions of compatible drivers in the instructions for your miner version.
And increase the size of the Virtual Memory (Pagefile) In Windows.