In a couple of months (like diff x 4) it will be interesting to try to undervolt it and test max freq w/ decent HW error rate.
Yeah, I think to do undervolt, the resistor R3 (right next to R12) can be pencil modded ... this should theoretically drop the voltage.
R12 would not be pencil modded in this case.
careful with R3! The voltage on the first (left most) yellow cap jumps from 1.1v to 2.6v when pencil lead gets on R3. I haven't tried to boot a miner with the first cap being so high. It could lead to disaster.....