Topic: [GUIDE] Undervolt antminer s1 [1.19W/GH at the wall] - page 22. (Read 69365 times)
I don't think it's possible to break anything with this mod, but in case you break something, I'm not responsible
Why undervolt the antminer s1 ?
Because with default voltage (1.1v), the chip has a very bad efficiency
What are the results ?
I wanted to achieve 0.85v on the asic. ( you can go at 0.75v if you want and share the result)
With this voltage my 3 antminer s1 are hashing at 140 GH/s each for 500 watts (166 watts per ant) (corsair AX1200i) [1.19W/gh at the wall]
all my ants have less than 1 % of HW (0.95 0.5 0.3)
What is needed ?
- a pencil HB
- an antminer s1
- a multimeter (ohms meter and voltmeter)
The following value works for an antminer with R3 resistor = 4.47 kOhms
http://i.imgur.com/VN07slQ.jpg
When adding pencil on R3, the result will be a lower voltage on the chip, so it's difficult to burn anything by doing it.
Voltage :
- Turn off your antminer ...
- Check the R3 value with the multimeter: it should be 4.47 kOhms (if not: the logic is the same but the next value are different)
- apply pencil on it
- Check the R3 value
- if R3 value is between ~2.8kOhms and ~3kOhms it's good, if not reapply pencil or remove it with your finger (it's not rocket science, so even if it's 3.1 don't loose your time ...)
- You can check the voltage of the chip with the voltmeter on the yellow things (the ant must be powered on) (~0.85v for me)
Freq (275 MHz):
edit /etc/config/asic-freq
Quote
option 'freq_value' '0A81' #275M
option 'chip_freq' '275'
option 'timeout' '45'
tips : 18Qauboa6wLq3pzzNWm8ppjSeHzqJEXRhb (BTC) F28JPPyP2iQT1BH6w8qYR79tGGzS54h5g8(HBN) WmUBNpvaaQk1a3hdfrkKgz8V6w9pjwvjYN(WDC)
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