What is joules per terahash (J/TH)?
Joules per terahash is the efficiency of a mining machine: the energy it uses to produce one terahash. Lower is better.
How it works
It is the machine's power draw in watts divided by its hashrate in TH/s. A machine that makes 200 TH/s at 15 J/TH draws 3,000 watts.
Why it matters
Power is the main running cost of mining, so efficiency decides which machines survive a low hashprice. Each generation of chips lowers the figure.
Live figures: ASIC miners ranked by efficiency.
Related terms
All terms: the Bitcoin mining glossary.
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