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RE: How profitable is CPU mining? Answered.
It's nice that the Odroid comes with powersupply and active cooler too. Just need to pop in a SD card and some kind of connectivity (wifi dongle or ethernet). My Pine64 is 8 mag, my RaspPi3's average 10 each. Orange Pis are still in the mail from China...
The problem I've seen is that my CPUs throttle because of the heat, and I tried attaching a USB fan and it fried one of the PSUs... :( With the fan, the Orange Pi One was running pretty nice. Maybe because of that is why my mag is pretty low.
Fortunately I had a couple of spare noctua 12v fans which I run off the Pi USB without isses; cool and quiet
It could be the fact that my PSUs are those cheap 5V 2A that are found on Amazon :p
Yeah I opted for official psus
Too much heat can really screw things up. My NanoPiM3 can only use 7 of the 8 cores. In fact, the OdroidXU4 throttles to 1.8-1.9ghz (2.0ghz max) even with the active cooler, plus another fan, and 21C ambient.