Quote from: herpderp991 on December 10, 2016, 09:21:15 PM

Found it here for anyone who is looking.

https://bitcointalk.org/index.php?topic=699064.760

So, R55 eh? What kind of resistance should I expect and do I need to add more, or reduce it to adjust the voltage down? I'm seeing 48.6Kohm.

I would use a Potentiometer and play with it, monitor the voltage. I think you should stay in the range of ~~0.9v-1.1v~~ at first, just to be safe. I'm use to play with the S1 board but never tried with the S3. the S1 had 4 chains of chips, so you needed 4 Pot / resistance per board.

There is all the clock and timing to be found with the voltage you want to use, that is the hardest part.

Found this ...

 Typical hash rate and power
Voltage(V) HashRate(GH/s) Current(A) Total power(W) W/GH
0.72 14.18 10.40 7.49 0.528
0.75 15.75 12.24 9.18 0.583
0.80 17.33 15.20 12.16 0.702
0.85 17.33 20.00 17.00 0.981

EDIT: Check that => https://bitcointalk.org/index.php?topic=771979.60

EDIT2: It looks like the Resistance to be change is R17 ... and it's 8 per board not 4 like the S1

Quote

R17 & R20 are not in parallel. R17 goes from the Buck Converter Output voltage to the VFB input. R20 goes from the VFB input to ground. R17 is the one to adjust or change.

Also remember you need to make the same change on the other 7 resistors on the other Buck Converters, then repeat for the second board.

Rich