Bitmain Antminer S21


Condition: Brand new in box
Efficiency: 17.5 J/T
Tariffs: Price includes all tariffs & import duties for US buyers. International DDP (duties prepaid) shipping option available.

SKU: ATBS21 Categories: , Tag:

Bulk Discounts

3 - 90.5%$3,829.76$4,267.56
10 - 241%$3,810.51$4,246.11
25 - 992%$3,772.02$4,203.22
100 +3%$3,733.53$4,160.33

Brand New Bitmain Antminer S21

  • Comes with ~1 year manufacturer warranty.
  • PSU included
  • Note: Antminer S21 runs on 220-277V voltage, it will not operate on household 110-120V voltage


Product Glance 
Algorithm | CryptocurrencySHA256 | BTC/BCH/BSV
Hashrate, TH/s188-200
Power on wall @25°C, Watt3500
Power efficiency on wall @25°C, J/TH17.5
Detailed Characteristics 
Power Supply 
Power supply AC Input voltage, Volt(1-1)220~277
Power supply AC Input Frequency Range, Hz47~63
Power supply AC Input current, Amp(1-2)20(1-3)
Hardware Configuration 
Networking connection modeRJ45 Ethernet 10/100M
Miner Size (Length*Width*Height, w/o package),mm(2-1)400*195*290
Miner Size (Length*Width*Height, with package),mm570*316*430
Net weight, kg(2-2)15.4
Gross  weight, kg(2-2)17.1
Environment Requirements 
Operation temperature,°C0~45
Storage temperature,°C-40~85
Operation humidity(non-condensing) , RH10~90%
Operation altitude, m(3-1)≤2000

Initial review of Antminer S21

Profitability Calculator

Frequently Asked Questions

Bitmain includes one power cord in the box with Antminer S21. This power cord is either a P33-P13 or C20 – P13 type. Your unit could have either one, and we have no way of knowing what’s inside the box for any specific unit. We recommend buying a cable seperately, to make sure you have one that works with your PDU. 

We were able to overclock it to about 235T in our benchmarking test with air cooling. 

Mining efficiency is highly dependent on ambient air temperature. If your miner is pulling more power than expected, in most cases it is due to a higher ambient temperature. You can improve mining efficiency by preventing mixing of hot exhaust air with intake air. 

We’ve seen most units with AMLOGIC A113D control boards and a few units with CV1835 control boards. 

All 4 fans on Antminer S21 have square fan connectors. 

Stock fans on Antminers can be very loud (~75 dB) at full speed. There are however multiple ways to make them quieter. 

  1. First way to make them quieter is to run them at substantial underclocking. This will significantly reduce the hashrate, but will also reduce fan noise, since the fans don’t have to run at full speed when underclocked. 
  2. Another way to reduce noise is by replacing stock fans with an inline AC infinity fan. You can learn more about this here. This method allows running the miners on stock hashrates and may even allow some overclocking in many cases. 
  3. Third way to reduce fan noise is by running the miners in immersion mode. In this method the miners are immersed in vats of mineral oil or dielectric fluid. This significantly improves heat transfer and enables substantial overclocking. Immersion mining however voids all warranty, is more complex to setup and immersion fluid can act as a solvent and damage some mining gear. We believe that this is still an experimental technology reserved for the most technically inclined. We do not recommend immersing Antminers to most customers for this reason. 

Stock Antminer firmware does not allow much flexibility in terms of overclocking/underclocking , fan control, automated temperature control etc. In most cases you would need aftermarket firmware to enable quieter operation. 

If your miner has an AMLOGIC A113D control board, you can easily install 3rd party firmware like BraiinsOS, LuxOS and Vnish. These firmware carry a 2-3% developer fees. 

If your miner has a CV1835 control board, you have fewer options, since this board is not widely supported by aftermarket firmware.

 You can also replace your stock control board with an aftermarket control board like ePIC UMC or MARA UCB 2100. Both come preloaded with advanced aftermarket firmware and have 0% developer fees. 

Weight36 lbs
Dimensions22 × 17 × 13 in

200T, 195T, 188T

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