I would underclock and undervolt otherwise, but I doubt the card would pull 166 sols.
The card most certainly does > 165 sols/s with 1400 GPU speed. Tested on all 5 of my cards and they all hit those figures.
What I meant is that if you underclock and undervolt the core, the card won't pull 166 sols.
There isn't much room for undervolting if you want to run it at 1350 core engine clock, you might even have to overvolt to get it stable at that speed.
Right now just mine ETH+SIA and you will make slightly more then ZEC.
Dual mining ETH+SIA heats up the GPUs much much more than ZEC, which makes the 470 too noisy for an office.
Plus my 295x2 will probably start throttling if I dual mine it since the temp limit is fixed at 75C.