Sometime only 1 card can launch success (My rig has 8 cards).
Did you try --dagintensity 1
You need to setup virtual memory. 40GB or more. Is ethereum classic working?
VRAM 40GB -> yes, my VRAM is set > 55G
--dagintensity 1 / ethereum classic -> no, I have no time to try.
Because the rig is not my own, so I need to switch to the older miner and keep working.
If I have the update information, I will post.