Efficiency
Work done per watt, the number that decides profit.
Mining efficiency is work per unit of power, quoted as hashes per watt or as joules per unit of work. Lower joules per unit is better, and it is the figure that separates two cards with the same hashrate.
It matters more than raw speed for anyone paying for electricity, because the power bill arrives every hour the rig is on. Measure it at the wall rather than from the driver, which reports the card alone.
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