Computer restarts under load, no blue screen, not power supply


So I have two PCs that I am using as bitcoin mining rigs and one of them is suffering from random restarts. The system:

MB: Biostar TZ77XE3
CPU: Intel Celeron G1610
Ram: 2 x 4gb Corsair Vengence
Graphics: 3 x Sapphire Radeon 7950
PS: XFX Pro 850 Watt (P1-850B-BEFX)

As I said, I have two of these systems and one is running flawlessly. The second will periodically restart while mining. Heat is not an issue, the CPU never gets above 40C and the GPUs are around 75C.

My first thought was the PS was bad, and so I tried it with another PS unit and it worked for longer than usual, but the system restarted overnight. I have also tried the RAM from the other system that I know is good, but restarts still occur. I have noticed that the system takes longer to restart after unplugging it and modifying components, but if I restart it right after its crashed it is quick to go down again.

At this point I think the MB is the issue. Thoughts? Is there something else I should look at before swapping the MB?
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More about computer restarts load blue screen power supply
  1. iam not sure about this, but check any memory dumps?
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