Modification of Bitmain Antminer S9 Low Power Mode and Dual - extend the life of outdated ASIC models

bitmain_antminer_s9_dualASIC miners Bitmain Antminer S9 after halving bitcoin sharply lost their relevance, because Almost all mining income began to go to pay electricity bills even at a cost of 0.03 USD per kilowatt. As a result, now you can buy such an ASIC miner for 50-60 USD along with a power supply. If you are also the owner of such devices, then do not rush to get rid of them, because you can still get from this ASIC income of 0.3 USD daily at a price of electricity 0.03 USD.



The main idea is to upgrade the ASIC miner to firmware with a lower hash rate, for example 10TH/s instead of 14TH/s. And it is not strange, but your mining income in this case will not only not decrease, but rather increase approximately 2-3 times from 0.1 USD to 0.3 USD per day. Which is comparable with the payback of ASIC for 60 USD for 200 days. Such an incident becomes possible due to the fact that with a decrease in the hash of ASIC chips, energy consumption decreases and energy efficiency increases at the same time.

Available Antminer S9 ASIC hashes and their power consumption:

13.5 Th/s - 1300W (96 watt -TH/s)

16.1 TH/s - 1350 watt (85 watt -TH/s)
15 TH/s - 1250 watt (83 watt - TH/s)
13.5 TH/s - 1050 watt (78 watt - TH/s)

10.5 Th/s - 750 watt (71 watt - Th/s)
With an increase in hashrate, energy consumption increases accordingly:
1600 watts - 16 TH/s
1800 watt - 17 TH/s
2500 watts - 19 TH/s
2700 watts - 22 Th/s
In our case, we are interested in the most energy-efficient option: 71 W/TH or 10.5 TH/s at 750W. In this case, the ASIC miner will bring an additional profit of 0.3 USD (at a price of 0.03 USD per kilowatt) and the expediency of selling it at current prices also becomes not so obvious.
To achieve such performance, you must install the BIOS with the Low Power Mode function. Such a BIOS can be downloaded for example here.

You can also take the opportunity to create the so-called dual ASIC Antminer S9, because with an energy consumption of 750W on one power supply, you can immediately hang two ASICs in maximum Low Power Mode. Moreover, the current control board allows this to be done with minimal modifications. It is only necessary to solder in addition 9 resistors (4.7 kOhm 0402) and 3 connectors with 18 PINs, and the connectors in this case are optional since Cables from boards with ASIC chips can be soldered directly to the control board.

To work with Asic miner Bitmain Antminer S9 in DUAL mode, you need to install the appropriate firmware, which can simultaneously manage 6 cards at once instead of 3.

Seats for installing resistors and connectors are shown in the image below.

For your convenience, we have added the Antminer S9 Dual 20.4Th / s and 1560W modification to the list of ASIC miners on the website of the calculator