Seems like that to fix the cublas error you have to boost the PL a lot. i cannot manage to get the PL below 90% without crashing every 10 mins.
It seems like the no-crash zone is between 95% and 100% PL, and this means higher temps and higher wattage....
EDIT: i don't know if it helps but i tried to lower the intensity down from 512 (gtx 1070) to 256...