Here's my ASIC stats:
...
why is ASIC 12 disabled?
BIST means built-in self-test. That ASIC has some hardware problems, and is likely physically defective.
ASIC 12 on SP3X machines has a high probability of failure due to the fact that the clock trace on the PCB is the longest for ASICs 12 and 27. Long traces mean more electrical noise and phase delay, which sometimes results in communication errors. However, the "All engines fail BIST" error is probably more likely due to a manufacturing defect or shipping damage. It happens sometimes.
Tigger's data table is a bit more optimistic than my data table for SP30s. I suspect he collected his data from an SP30 that was slightly faster than average. Here's my data, in ugly copy-pasted format:
hashrate AC usage Efficiency J/GH
4597 3056 0.665
4458 2928 0.657
4288 2704 0.631
4093 2480 0.606
3831 2160 0.564
3611 2000 0.554
3325 1792 0.539
3047 1536 0.504
2727 1328 0.487
2344 1120 0.478
It seems your machine is a bit slower than the one I tested here, but that's to be expected if one ASIC is dead. It's fairly close, though. Also, your machine is likely a bit less efficient than Tigger's machine and my machine because you're using a lower voltage (~210 V), and your environment is quite a bit warmer than ours.
Also, if you underclock your machine, you should reduce the fan speeds to reduce the amount of power used by your fans. In our environment, we've been able to use fan speeds of 50 at AC power below 2.6 kW, 40 below 1.7 kW, and 30 below 1.2 kW. You're using a setting of 70 at 1.85 kW, which is where I'd be using either 50 or 40, depending on season.
