IMHO the voltage settings make no difference with the S3+ ( change on GUI without modifying config files )

I have tried alot from 0500 (which is too low für the asic to run) up to 0800. On my tests it make no difference on GH/s or power-consumption or HW-Err.

Only setting of Frequency makes a differnce.

Freq   Volt   Watt   Temp A B   Fan   GH/s   HW   W/GH
225   0,77   380   38   36   1600   449   0   0,846325167
250   0,77   440   39   36   1800   505   0   0,871287129
250   0,72   440   39   36   1800   505   0   0,871287129
200   0,72   330   37   25   1500   408   0   0,808823529
100   0,72   161   36   35   1000   210   0   0,766666667
100   0,50   161   34   33   1000   208   0   0,774038462


Always with power off/on and running for 1 hr.