Overview of the differences between Bitmain Antminer S21 Pro and previous models

The modern mining hardware market is developing rapidly, and each new line of Bitmain devices sets new standards of efficiency. The introduction of the Antminer S21 Pro version has brought performance and energy efficiency to a fundamentally different level. Below, we will take a closer look at how it differs from previous models and what tasks it is best suited for.

Evolution of the S21 line

The basic model was launched in early 2024 and immediately became popular due to the combination of 200 TH/s hashrate and moderate power consumption of 3500W. It has become the choice of miners seeking stable performance on a limited budget.

Later, the S21+ was released, a device designed for more demanding users. Its performance reached 235 Th/s with a power consumption of 3564 W, and its energy efficiency improved to 16.5 J/Th. This model became a bridge between the standard and professional versions.

At the top of the series is the S21 Pro, a model for industrial farms and professionals seeking maximum return on investment. It demonstrates a hashrate of about 234 Th/s with a power consumption of only 3510 W and an energy efficiency of 15 J/Th – one of the best in the industry for 2025.

For stable operation under heavy loads, an advanced air cooling system with two powerful fans is used to maintain optimal temperature even during round-the-clock operation. The noise level of about 75 dB makes the device suitable for use in professional rooms with ventilation or noise insulation. The Pro version is especially appreciated for its stable hashrate, minimal deviations at elevated temperatures, and simple firmware update process.

Comparison of S21 models

Compared to previous versions, the Antminer S21 Pro specifications show a noticeable technological progress. Below is a brief comparison of the main parameters of the three models:

The difference between the versions is not limited to numbers – each device is optimized for its own audience. The plus version is an intermediate position between the basic and premium versions, offering an optimal balance of energy efficiency, price and performance. Pro is aimed at long-term operations where the priority is not only speed, but also lower operating costs.

When to choose the S21 Pro

Bitmain Antminer S21 Pro is not for everyone. For small home farms, its operation may be excessive, but for large mining centers, it will be the best choice. Here are the main reasons to invest in this model:

• minimal energy consumption with significant productivity;
• reliable design and long service life;
• support for the most popular SHA-256 coins (Bitcoin, Bitcoin Cash, etc.)
• readiness to operate at high network complexity after the 2024 halving.

Before purchasing, it is important to calculate the payback taking into account electricity tariffs. In practice, the model demonstrates one of the best returns among all ASIC miners in 2024-2025.