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One String Miner Test 1

Today I was wondering why the first 8 build OSM (One String Miner) only hash between 23 en 26 GHs. I measured the voltage input in the boards: 11.4 V !! The PCI-E connectors from the PSU “only” supply 11.4V instead of 12V. Weird, I will investigate tomorrow. I had 4 DIY-1 kits left, build the first one just standard: pcb + heatsink. For power I used a cheap 12V 10A PSU from Dealextreme. You can adjust the 12V power output on the PSU some time for some tests:

No thermal paste between PCB and Heatsink + Artic F8 Fan (very low RPM)

Voltage [V] Temp [°C] Hashrate [GH/s]
12,22 56 32,8
12,30 58 32,26
12,14 57 32
11,91 54,6 31
12,40 59 31,6
12,10 56 31,4

With thermal paste between PCB and Heatsink + No Fan We will see how temperate gets higher after x seconds

Voltage [V] Temp [°C] Hashrate [GH/s] Time [sec]
12,10 35 31,70 10
12,10 36,6 31,80 60
12,10 39,2 32,05 120
12,10 40 32,08 180
12,10 40,7 32,14 240

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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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