Efficient 1660 Super OC Settings???

Anyone able to find efficient and stable OC settings for this card mining RVN?

Currently running: Core +100 Mem clock +300 Power limit 120 Fan 80%

I get about 14-14.5 MH with this but I’m using more power than I’d like to and they run at like 70-73 degrees C

I’m new to mining and invested in a rig with 6 of these cards and I was hoping mining RVN would be a little more power efficient