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)
With thermal paste between PCB and Heatsink + No Fan We will see how temperate gets higher after x seconds
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:
- 0.981 V -> hashrate: 2.5 – 2.6 Gh/s = stock / unmodified
- 1.025 V -> hashrate: 2.6 – 2.7 Gh/s = test run #1
- 1.050 V -> hashrate: 2.7 – 2.9 Gh/s = test run #2
- 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