Antminer S21 Review: Unmatched Performance and Energy Efficiency for Bitcoin Mining
The Antminer S21, unveiled by Bitmain at the World Digital Mining Summit 2023 in Hong Kong, has set a new benchmark for Bitcoin mining hardware. With groundbreaking power and efficiency, this machine is a game-changer in the mining industry. This review delves into the Antminer S21’s performance, efficiency, design, and improvements over older models, explaining why it stands out as a top choice for miners.
Overview of the Antminer S21 Series
The Antminer S21 series includes two models with distinct cooling mechanisms:
- Air-Cooled Version: Offers a maximum hashrate of 200 TH/s and an impressive efficiency of 17.5 J/TH, making it the most powerful air-cooled Bitcoin miner available.
- Hydro-Cooled Version: Utilizes water cooling to achieve even greater performance and efficiency.
Bitmain has prioritized innovation in power, energy efficiency, and design, cementing the S21’s position as a premium tool for professional miners.
Antminer S21 Performance Analysis
Performance is a critical factor for any mining machine, and the Antminer S21 excels across various conditions. Here’s how it performs under different scenarios:
Testing Method
- The Antminer S21 was run for 30 to 60 minutes to stabilize.
- Tests were conducted in controlled environments at temperatures of 10°C, 20°C, 25°C, and 40°C.
- Key metrics like hashrate and power consumption were recorded.
Firmware Options
- Stock Firmware: Automatically adjusts power usage and slows down under high temperatures to ensure safety.
- Custom Firmware: Advanced users can opt for third-party firmware like LuxOS to fine-tune settings for enhanced performance.
Key Takeaways:
- Optimal performance is achieved at lower temperatures.
- Safe operation is maintained up to 45°C with the stock firmware.
- Custom firmware unlocks additional optimization potential for experienced users.
Antminer S21 Design and Build Quality
Bitmain has engineered the Antminer S21 with durability and functionality in mind, resulting in a machine built to withstand demanding conditions.
Size and Weight
While the S21 maintains the dimensions of the S19 series, it is approximately 1 kg heavier due to upgraded materials and enhanced cooling features.
Cooling Improvements
- Air-Cooled Version: Equipped with advanced fans for efficient airflow, ensuring stable performance even in warm environments.
- Hydro-Cooled Version: Maintains lower operating temperatures and operates with reduced noise, making it ideal for large-scale operations.
Power Supply
The S21’s upgraded power supply unit (PSU) delivers stable energy, supporting consistent performance under heavy loads.
Durability and Reliability
Enhanced cooling systems and high-quality materials ensure the S21’s longevity and reliability, even in challenging mining setups.
Energy Efficiency and Profitability
Energy efficiency is crucial for maximizing profitability in Bitcoin mining, and the Antminer S21 delivers exceptional results with an efficiency rating of 17.5 J/TH.
Cost Savings
The S21 significantly outperforms older models like the S19 series:
- Antminer S19j Pro: 29.5 J/TH
- Antminer S21: 17.5 J/TH
This 40% improvement leads to substantial savings, especially for large-scale mining operations.
Maximizing Profit
Custom firmware allows miners to adjust settings for optimal energy usage, further enhancing profitability.
Comparison: Antminer S21 vs. S19 Series
The S21 is a clear upgrade over the S19 series, offering:
- Higher hashrate
- Better energy efficiency
- Improved cooling options
Main Benefits of the Antminer S21
- Great Efficiency: With 17.5 J/TH, it significantly reduces electricity costs.
- High Hashrate: Delivers up to 200 TH/s in the air-cooled version.
- Advanced Cooling: Offers air-cooled and hydro-cooled models to suit different needs.
- Superior Build Quality: Enhanced materials and components ensure reliability.
- Custom Firmware Support: Provides options for performance tuning.
Antminer S21 Profitability Today
Antminer S21 Asic Miner Profitability generally depends on factors such as electricity costs, mining difficulty, and coin prices. For the most accurate and up-to-date numbers, please use the live profitability calculator below.
Release Date: 2023
Algorithm: SHA-256
| Best Coin | Hashrate | Power | Algorithm | Mining Reward | Power Cost | Profit (USD) |
|---|---|---|---|---|---|---|
 Bitcoin (BTC) |
200.00 TH/s | 3500 W | SHA-256 | USD | USD | 6.11 USD |
Note: Electricity Cost = 0.06 USD / KWh
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Frequently Asked Questions (FAQ)
- What is the hashrate of the Antminer S21?
- The air-cooled version delivers a maximum hashrate of 200 TH/s.
- How efficient is the Antminer S21?
- It achieves an efficiency rating of 17.5 J/TH.
- What temperature range does the Antminer S21 operate in?
- It operates efficiently up to 45°C.
- What power supply does the Antminer S21 use?
- The S21 is powered by the APW171215a PSU, ensuring stable energy delivery.
- Is there a hydro-cooled version of the Antminer S21?
- Yes, the S21 comes in both air-cooled and hydro-cooled versions.
- Can the Antminer S21 be overclocked?
- Yes, custom firmware enables overclocking for improved performance.
- How does the S21 compare to the S19 series?
- The S21 offers 40% better efficiency and a higher hashrate than the S19 series.
- What are the dimensions and weight of the Antminer S21?
- Dimensions: 400x195x290 mm. It is about 1 kg heavier than the S19 series.
- How long will an Antminer S21 last?
- With proper maintenance, it can last for several years.
- How can I make the Antminer S21 more efficient?
- Operate within a temperature range of 10°C to 25°C and use custom firmware for fine-tuning.
Conclusion
The Antminer S21 stands out as a powerful, efficient, and reliable Bitcoin mining machine. Its combination of high hashrate, superior energy efficiency, and innovative design makes it a top choice for both individual miners and large-scale operations. Whether you’re upgrading from an older model or starting fresh, the Antminer S21 is a worthwhile investment for maximizing your mining profitability.