After some serious trial and error, reboots, and individual tweaks balancing the power needs, heat, and hash of the base Asus GeForce GTX 1660 (single fan) with Micro memory, I can say that I have hit the sweet spot. I wanted to post this for anyone else out there that is suffering (and jealous that they don’t have the Ti or Super) - this is for the base card. For the past 20 hours or so, it has been incredibly stable, I have had no (zero) rejections or stale shares, and it keeps trucking at a very efficient power setting while remaining cool. I have a rig from MiningCave featuring 6 of these cards for a total reported hash rate of 156.8 MH using Ethash/Pheonixminer.
I am new to this, and this forum has helped me start this adventure in squeezing the most out of these cards. I am wondering how others with similar base cards are doing. Am I missing some untapped setting? Cards are stock bios.