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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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One String Miner

Today I received my One String Miners. Great design by C-scape and Intron based on Bitfury chips. I won some miners at an auction at bitcointalk.com . Ben Turas is selling these great miners, designed in the Netherlands, produced in Asia!
Check out his salestopic.

The OSM is based on Bitfury chips and each board contains 15 chips, hashing 25+ GH/s without heat sink and 30+ GH/s with heat sink.  Each board runs from a single 12V supply, using ~25W.

I have 4 DIY1 and 4 DIY2 kits. This evening I build up the 4 DIY2 kits and build a small tower. Quality of the boards and other materials is high. Building was very easy. Screw the pcb to the heatsink, connect the wires to the powerconnectors, that’s about it. I used a BeQuiet PurePower 600W PSU I had laying around. Attached two fans, all in a temporary setup. 10 Port USB Hub is a Rosewill RHB-500. I used an ArchLinux PC, downloaded and compiled CGminer 3.12.3, turned on the miners, started CGMiner and it detected all miners. 3 miners were “ZOMBIE” at first but after just 10 seconds all boards were recognized and hashing. All works great with any issues. Temperatuur is stable with only 2 fans (in the most efficient position), 30 to 40 degrees Celcius. I haven’t tuned them yet so they hash around 25GH/s per board.

For now some photos, next few days I will do some more tests and tuning. I realy like these boards you should get some too!

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