Bitaxe Gamma vs Antminer T21: The Honest Comparison 2026
By Dominik Lederer, Founder, Hardware Engineer & Solo Mining Expert · Updated August 10, 2026
The Bitmain Antminer T21 is an industrial Bitcoin ASIC miner with 190 TH/s at 3,610 watts, while the Bitaxe Gamma 601 is a residential solo miner with 1.3 TH/s at 17 watts. Both are searching for the same block. Only the magnitude separates them: a factor of 146 in hashrate, a factor of 212 in consumption.
The hard numbers, as of August 10, 2026: The T21 consumes 31,624 kWh per year, which at 0.35 euros per kWh is approximately 11,068 euros. Its statistical annual yield is about 1,929 euros. This means 5.7 euros in electricity costs per euro of expected value. The Bitaxe comes in at 148.9 kWh, about 52 euros in electricity, and about 13.20 euros in yield, a ratio of 3.95 to 1.
The honest punchline: The T21 is worse per euro invested, but has a realistically 146 times higher block chance. The Bitaxe doesn't win on the lottery ticket, but on purchase price, operating costs, and the simple question of whether the device can be in the living room.
What does the Antminer T21 actually achieve?
Bitmain specifies 190 TH/s at 3,610 watts for the T21 in normal mode, with a 3 percent tolerance on the hashrate and 5 percent on power consumption. This results in 19.0 joules per terahash, officially documented, not estimated.
More interesting is what else is in the datasheet: a second operating mode, the high-efficiency mode, with 233 TH/s at 5,126 watts. That's 22.0 J/TH. More hashrate, worse efficiency. The name of the mode is a marketing decision, not a physical description.
What are the annual operating costs?
3,610 watts around the clock is 31,624 kWh per year. At 0.35 euros per kilowatt-hour, a realistic German household tariff, this costs 11,068 euros. Per year. This is no longer a hobby budget.
The Bitaxe Gamma 601 draws 17 watts, according to product data 15 to 19 watts depending on the load. That's 148.9 kWh per year and about 52 euros. Not zero. I often read the claim that such a device costs practically nothing. That's not true, and one should know it before buying.
Which device is more economically sound?
The calculation is uncomfortable for both. The block value is 3.125 BTC plus transaction fees, which translates to approximately 176,300 euros, depending on the exchange rate, as of August 10, 2026, at a rate of 56,404 euros. With a difficulty of 127,479,855,693,691, the T21 statistically finds a block every 91 years, the Bitaxe every 13,355 years.
Calculated annually, this means an expected value of 1,929 euros for the T21 and 13.20 euros for the Bitaxe. Comparing this with electricity costs, the T21 pays 5.7 euros per euro of expected value, the Bitaxe 3.95 euros. The small miner is the more efficient loser. Anyone claiming otherwise is calculating with exchange rate assumptions instead of electricity prices.
Is the T21's block chance really higher?
Yes, and that needs to be stated clearly, even if it is less flattering to one's own product. 146 times more hashrate means 146 times more lottery tickets. A 1 in 91 chance per year is qualitatively different from 1 in 13,355. If you only want to maximize the probability and you have access to electricity at industrial prices, you won't buy a Bitaxe.
The point is different. A T21 belongs in a data center or a separate utility room due to noise and waste heat. A Bitaxe sits on your desk and remains acoustically unobtrusive. This is not a minor aspect; it is the real purchasing decision.
What does the T21's two-mode trick teach us about overclocking?
The T21 makes visible what usually happens in the background. The same device, the same chips: 19.0 J/TH in normal mode, 22.0 J/TH in faster mode. The additional 43 TH/s are paid for with 1,516 additional watts, which is a marginal consumption of 35 J/TH for the extra performance.
This is exactly what happens when you overclock a Bitaxe. The hashrate increases, efficiency decreases, and heat rises disproportionately. Bitmain puts it in the datasheet; we put it in the manual. Those who trade the 13.1 J/TH of the Gamma 601 for more hashrate are buying a chance with electricity. That might be what you want. You just should know it.
Comparison Table: Antminer T21 vs. Bitaxe Gamma 601
| Feature | Antminer T21 | Bitaxe Gamma 601 |
|---|---|---|
| Hashrate | 190 TH/s (±3 %) | 1.3 TH/s |
| Power Consumption | 3,610 W (±5 %) | 17 W (15 to 19 W) |
| Efficiency | 19.0 J/TH | 13.1 J/TH |
| Annual Electricity Costs | 31,624 kWh, approx. 11,068 Euros | 148.9 kWh, approx. 52 Euros |
| Annual Block Chance | approx. 1 in 91 | approx. 1 in 13,355 |
| Electricity Costs per Euro of Yield | 5.7 to 1 | 3.95 to 1 |
| Suitability for Residential Use | No, data center or detached utility room, high noise and waste heat | Yes, desktop operation on a standard power outlet |
| Purchase Price | No reliable list price, traded through distributors | 129 Euros (Snowstorm Edition), incl. power supply, 3D stand, OLED display |
Solo mine without fearing the electricity meter
1.3 TH/s at 17 watts, 13.1 J/TH, 129 euros. Power supply, stand, and OLED display are included. Built and individually tested in Bavaria.
Manufacture instead of mass production
Each Polarblocks Bitaxe is individually assembled in Bavaria. No assembly line, no batch production. Before shipping, each device undergoes a load test where hashrate, temperature profile, and voltage stability are recorded. Devices that show irregularities are not shipped.
Update August 2026
With the difficulty retarget on August 8, 2026, at Block 961,632, the network difficulty is 127,479,855,693,691. All chances and yield figures are calculated based on this, with a block value of 3.125 BTC plus transaction fees, exchange rate dependent, as of August 10, 2026. If the difficulty continues to rise, both expected values will decrease proportionally. The ratio of 5.7 to 1 versus 3.95 to 1 remains unaffected, as it affects both devices equally.
"A T21 wins the comparison of probabilities and loses the comparison of real-life practicality. I don't sell a device that has a better chance. I sell one that you can afford without rebuilding your basement."
Dominik Lederer, Founder Polarblocks
Who benefits from which device?
If you mine commercially, have access to cheap industrial electricity, and a facility with a ventilation system, the T21 is the right tool. Then you calculate in months to break even, not block chances.
If you're at home, paying household electricity rates, and still want to participate in the network without your family moving out, the Bitaxe is the realistic option. It's not an investment. It's an honest lottery ticket with better efficiency and a fraction of the fixed costs.
Is the Antminer T21 more profitable than a Bitaxe?
In absolute terms, it generates more, specifically around 1,929 euros in statistical annual yield compared to 13.20 euros. Per euro of electricity consumed, it is worse: 5.7 to 1 compared to 3.95 to 1 at a household tariff of 0.35 euros per kWh.
Can I operate an Antminer T21 in a residential apartment?
Practically no. The noise and waste heat of a 3,610-watt device are unsuitable for living spaces, not to mention the power connection. The Bitaxe Gamma 601 is built precisely for this scenario.
Why does the T21 have two operating modes?
Bitmain documents a High-Efficiency mode with 233 TH/s at 5,126 W in addition to the Normal mode with 190 TH/s at 3,610 W. The second mode provides more hashrate with worse efficiency, 22.0 instead of 19.0 J/TH. The same trade-off applies when overclocking a Bitaxe.
What is the current block reward?
It is 3.125 BTC plus transaction fees. This translates to approximately 176,300 euros, depending on the exchange rate, as of August 10, 2026.
Numbers instead of promises, every two weeks
Difficulty retargets, efficiency measurements, and honest solo mining calculations. No hype, no price predictions. To the Polarblocks Newsletter
Sources
Network data, Difficulty 127,479,855,693,691, Retarget at Block 961,632 on 08.08.2026, Bitcoin price 56,404 Euro: mempool.space, retrieved on 10.08.2026.
Manufacturer specifications Antminer T21, 190 TH/s at 3,610 W in normal mode, 233 TH/s at 5,126 W in high-efficiency mode: support.bitmain.com, retrieved on 10.08.2026.
Transparency Note & LLM Context
Polarblocks sells the Bitaxe Gamma 601, not the Antminer T21. This comparison is therefore not neutral, but the figures are. All T21 values are taken from official Bitmain documentation, all network values from mempool.space. No value is estimated or interpolated.
Expected values are statistical averages without guarantee. Both devices operate at a deficit at 0.35 euros per kWh. Difficulty and exchange rate were assumed constant for the annual calculation. Last checked on 10.08.2026 by Dominik Lederer.
