Just curious what temperatures would be considered "safe". I received my Z9 mini yesterday, and I bumped it up to 750MHz almost right away. It mines at Flypool at an average of 16.4kSol/s (measured poolside). Rejected shares at appr. 0.4% and stale shares at 0.2% according to the miner interface. Now, this time of year it gets pretty hot outside, and I have the asic in my garage, which is even hotter. Chip temps are 74, 76 and 78 degrees (midday) while PCB-temp is 59, 62 and 63 degrees. Last evening/night the chip-temps were below 70 degrees. No registered HW errors.
Back down on the overclock or continue to let it rip?