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.
This sounds a little more interesting. If the power consumption can drop 25% but the hash rate maybe 10% that would give them a longer life in the future.