Start 1 #1: I run the miner on the first to GPU, good hashrates ±560, when i start mining the 3rd GPU-system crash/shut down
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I also watch the GPU temperatures, it reached 90c on some settings - on other settings the GPU temperature was quite ok (maxing 81 for one GPU the others at about 60) but the GPU was reaching 99% constantly (on other settings the was to change in load).
Couple of ideas:
1. not enough power to the system, once you start the 3rd card the system will crash out, I would have thought 850w should be enough though.
2. getting too hot - run with case open and a big fan pointing straight at system.
3. one card is faulty - try mining with each card for an hour by itself.
For 1 and 2 undervolting may help. You should be able to drop the volts (VDDC in afterburner) to 1.030 at stock clocks.