This is an instruction of New Multi-option Firmware for Bitmain Antminer S9, Bitmain Antminer S9i, Bitmain Antminer S9j, and Bitmain Antminer T9+.
In order to support Bitmain Antminer S9, S9i, S9j, and T9 + miners, four multi-option security firmware have been released. Only a small number of S9 miners that use the C5 control board are supported by the firmware. The new firmware can be accidentally upgraded without consequence. The control board type will be automatically verified by the firmware. If it is C5, the firmware upgrade will not be performed, and the miner’s version number will not be changed.
A drop-down menu of “Working Mode” has been added to the “Miner Configuration” web page of the miner. You can select the appropriate option to increase hash rate or the appropriate option to decrease power consumption. It is advised to set the option for multiple miners to operate simultaneously using the Antpool/BTC.com tools.
The multi-option drop-down menu screenshot of Bitmain Antminer S9/S9i/S9j is as follows:
The multi-option drop-down menu screenshot of Bitmain Antminer T9+ is as follows:
Drop-down menu description:
| Option | Description |
| Normal | Normal working mode, the working voltage and frequency remain unchanged |
| HashRate+0.5TH/S~+2.0TH/S | Increasing the working frequency, expect to improve from 0.5~2.0TH/S respectively based on the initial ideal hash rate |
| HashRate Unchanged-Lower Voltage | Decreasing the working voltage and working frequency, hash rate remains unchanged, reducing the power consumption |
| HashRate-0.5TH/S~-3.0TH/S | Decreasing working voltage and frequency Decreasing Hash rate by 0.5~3.0TH/S respectively Reducing the power consumption |
| Low Power Enhanced Mode (only for S9/S9i/S9j) | Decreasing working voltage and frequency, hash rate will be decreased by around 4.5TH/S for S9 and 3.5TH/S for S9i/j respectively, reducing the power consumption |
- NOT Recommended to Upgrade to Multi-Option Firmware
(1) Miners have the following issues:
When using the standard firmware, issues such as missing hash boards or chips, an unstable hash rate, etc. cause the hash rate to be roughly 5% below the ideal hash rate.
(2) Power supply has the following issues:
a power supply that is unstable, or less than 1400W of power
- Power Supply Requirement and Option Adjustment Suggestions
(1) For Bitmain Antminer S9, Bitmain Antminer S9i, and Bitmain Antminer S9j:
+0.5T option can be supported by 1400W power supply,
+1.0T/+1.5T/+2.0T options can be supported by 1600W power supply.
(2) For Bitmain Antminer T9+ miner:
1600W power supply can support up to 12T hashrate after the over-frequency.
1800W power supply is needed if the hashrate is equal or more than 12.5T after the over-frequency.
Note: Even if the power supply is within the recommended range, it might not function properly due to the differences between the power supply and miners.
(3) You can refer to the following suggestions to use over the frequency options:
First, run in the “Normal” option for some time. Select the +1.5T option if it is stable. When considering the power supply and ambient temperature, the miner can run in the +1.5T option with a stable condition. If the +1.5T option is unstable, it is advised to downgrade the option to +1.0T/+0.5T.
- The conditions recommended using a lower over-frequency option
(1) Power supply has the following issues:
Failure to supply current using the frequency option, power outages, and so forth.
(2) Miners have the following issues:
Lack of hash boards or chips, insufficient hash rate, overheating protection (real-time hash rate is 0), and so forth.
- Normal situations after using over frequency option
(1) The hash rate is 0.5T less than the target:
For instance, if the miner’s hash rate is 14T and the +2T option is chosen, the actual hash rate is 15.5T. Here, we have the choice of maintaining the current configuration or downgrading to +1.5T.
(2) The hash rate is 0.5T higher than the target:
For instance, if the miner’s hash rate is 14T and you choose the +2T option, the actual hash rate is 16.5T. For this circumstance, we have the option to stay in the option.
