Compare two mining machines side by side on efficiency, daily net profit and payback — using your own electricity price.
Two machines, same electricity price. Efficiency in joules per terahash decides which one survives a downturn — not headline hashrate.
Machine A
Machine B
Better machine at these inputs
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A efficiency0 J/THB efficiency0 J/THA net / day$0.00B net / day$0.00A payback—B payback—
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What this does not model
Difficulty is held constant, so both payback figures are a best case. Resale value, hosting, cooling and failure rates are excluded. A machine that wins on payback can still be the wrong buy if it is a generation behind on efficiency, because that is what decides which unit gets switched off first when price falls.
Why efficiency decides it
Two machines producing identical revenue can have completely different survival odds, because revenue depends on hashrate and cost depends on efficiency. When coin price falls, revenue falls and your power bill does not. The machine still running afterwards is the efficient one.
That is why this tool leads with joules per terahash rather than payback. A cheaper machine with a shorter payback at today’s prices can be the first unit you switch off in a downturn, and an ASIC that is switched off permanently has no resale market worth the name.
Reading the verdict
Where both machines are profitable, the ranking is on payback. Where neither is, the tool says so rather than declaring a winner — “loses less money” is not a recommendation. Where only one pays, it wins regardless of efficiency.
Difficulty is held constant, so both payback figures are a best case. See why mining difficulty adjusts for how much that flatters the number.
