Antminer S21 Overview: Inspecting the S21’s Efficiency at Completely different Ambient Temperature

In our Antminer S21 overview, 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 newest era of ASIC miner launched by Bitmain in 2023 with the SHA256 algorithm. It may well presently mine BTC/BCH/BSV. S21 specification is disclosed by Bitmain official with hashrate 200T and energy effectivity 17.5J/T. Bitmain additionally exhibits the affect of temperature on hash charge and energy consumption ratio on the web site. Looks as if S21 is probably the most environment friendly Asic miner to date, due to this fact we did two samples to check the true efficiency.

About S21 testing knowledge

1. 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 will likely 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 a better 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 enhance of 1.74W/T when the hashrate reaches 200T inside 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 charge 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 speedy 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 supplied by the producer. Moreover, the hash charge demonstrates substantial fluctuations below high-temperature circumstances. Below some excessive temperatures or harsh environmental circumstances, the S21 fails to attain the required energy consumption ratio it claimed and loses its aggressive benefit available in the market.