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Antminer U1 mod & tune up

I have one “bad” Antminer U1. Well… bad… at stock Freq it runs fine, when I tune it to 0981 it has about 30% hardware errors. Time for some research and tune up. I took off the cooling plate with the antminer logo. There is no cooling pasta between the plate and the PCB but some kind grey rubber something. Must be conducting too I guess but threw it away. First I wanted to fit a huge CPU cooler from an old Dell PC but it’s a little overkill. I had an alumium heatsink, cut a bit off with a saw. Drilled two holes in it for the screws. Applied some thermal paste, fitted the heatsink and tightened the screw. Applied the Antminer cooling plate just for the looks.

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Hashbuster Micro Heatsink + Thermal Paste

Update December 11th:
Today I tried to tune the Hashbuster Micro a little more without overclocking it, just a “hardware” tweak. I put some non-conductive Thermal Paste between the heatsink and PCB.

  • Disconnect the power- and usbcable
  • Unscrew the 4 screws on each corner where the fan is attached to the pcbspacers (the fan holds the heatsink in place)
  • Simply remove the heatsink
  • Put nine dots of paste on the “golden” squares (that’s where the chips are)
  • Place back the heatsink, press it lightly and move it around/side to side a little so the paste gets spread
  • Put back the fan and tighten the 4 screws
  • There is a change that some thermal paste leaks through some very little holes in the PCB. You will see some “worms” on top of the PCB (where the components are). Clean it with a dry cloth.
  • Reconnect the power- and usbcable and start mining again

Now you should see some temperature drop. I my case temperature dropped from about 45 degrees celcius to a 30 to 33 degrees. Maybe I used a little bit too much thermal paste, I think if you half the dots you see on the photo it should be enough 🙂


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Tuning a Hashbuster Nano

The bitcointalk.org forum is great and contains lots of info about the bitcoin, market, software, hardware, and so on. It’s a worldwide community and most people are sharing lots of info and help people who have some problems or questions.

Recently I bought 10 Hashbuster Nanos and today I took 1 board away  from my tower and started to experiment with it. Try to get it hashing at a higher rate. Standard hashrate is bewteen 2.5 and 2.7 Gh/s. On the board you can play with the voltage which feeds the ASIC chip. Higher voltage means higher hashrate but also more heat! So (extra) cooling is essential. Bitcointalkmember XBOCT posted some very useful tips and tricks.

I did several tests with the board:

  1. 0.981 V -> hashrate: 2.5 – 2.6 Gh/s = stock / unmodified
  2. 1.025 V -> hashrate: 2.6 – 2.7 Gh/s = test run #1
  3. 1.050 V -> hashrate: 2.7 – 2.9 Gh/s = test run #2
  4. 1.124 V -> hashrate: 2.9 – 3.07 Gh/s = test run #3 going nuts

What the maximum voltage is for the ASIC-chip I don’t know, I have to find out later. Have the guts to nuts and just do some crazy experiments 🙂 Continue reading