In our Antminer S21 evaluation, we examined S21’s hashrate and effectivity at a spread of various temperatures and when it was transformed to oil-cooled to check its actual efficiency.
S21 is the most recent era of ASIC miner launched by Bitmain in 2023 with the SHA256 algorithm. It could at present mine BTC/BCH/BSV. S21 specification is disclosed by Bitmain official with hashrate 200T and energy effectivity 17.5J/T. Bitmain additionally reveals the affect of temperature on hash price and energy consumption ratio on the web site. Looks like S21 is probably the most environment friendly Asic miner to date, due to this fact we did two samples to check the actual efficiency.
About S21 testing knowledge
- At ambient temperature
2. At warmth tolerance temperature
The S21’s tolerance temperature is 48℃. When the ambient temperature surpasses 40℃, the hash board will activate over-temperature safety, leading to a underclocking of the chip. The frequency can be decreased from 490M to 440M. If the temperature exceeds 47℃, the S21 miner will routinely shut down as a security precaution.
3. Beginning at low temperature
S21 can begin and function successfully at -10℃. Whereas it begins usually at -20℃ and -15℃, the system will activate low temperature safety and shut down the miner. Subsequently, the S21 requires the next preliminary temperature in comparison with the S19XP.
4. When changing air-cooled to oil-cooled
Oil-cooled model has improved the unit energy density in contrast with air-cooled, however when air-cooled is transformed to oil-cooled, it additionally faces guarantee points and has much less benefits than particular immersion-cooled miners. When S21 converts air-cooled to oil-cooled, the facility consumption ratio is larger than 18.5W/T at 50℃, begins to underclock at 55℃, and it’s in high-temperature safety at 60℃.
5. Begin at every temperature level
The ability consumption ratio experiences an approximate improve of 1.74W/T when the hashrate reaches 200T throughout the temperature vary of 20℃ to 35℃. At 40℃, a discount within the frequency of the S21 happens, leading to an working frequency beneath 440M and a hash price of 180T. Moreover, at 45℃, the facility consumption ratio will increase by roughly 2.4W/T. As soon as the temperature exceeds 45℃, safety mode is initiated, resulting in a fast rise within the energy consumption ratio.
It has come to our consideration that when two S21 air-cooling miners are working at temperatures of 25℃ and above, their energy consumption ratio considerably exceeds the official specs offered by the producer. Moreover, the hash price demonstrates substantial fluctuations underneath high-temperature situations. Underneath some excessive temperatures or harsh environmental situations, the S21 fails to attain the required energy consumption ratio it claimed and loses its aggressive benefit out there.
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