So besides noise & heat, does it really pay to underclock vs. stock on the SP20? I tried to run the numbers allowing a total of 4200 watts at the units (not wall). I used 700w for underclock at 1200gh/s and 1200w for 1600gh/s. My calc shows about $697 higher price for 6 underclocked units vs. 4 stock units. The underclocked higher hashrate would take over 600 days to return the higher price of underclocking.
Am I missing something?
Depends on your electricity price. At current BTC/USD value, I'm losing money running at stock.
M
That's why I used a fixed wattage so that the electric would be the same in the comparison. It's just additional hashrate at lower w/gh but higher $/gh.