@azaman are you using Linux OS? it seems that the --oc1 works to me fine the --oc2 reduce my power consumption and there's a little reduce in hashrate compared on using --oc1.
I'm using windows 10 with 4.19.17 driver installed.
Have you tried down grading or upgrading your driver latest or below version?
Hi, yes im using linux - Im using Hiveos. driver is 418.43
oc1 is supposed to be more efficient.
oc2 is maximum performance. (great if electricity is cheap)