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?
From what I have read and even from my experience with GPUs sub 80 is your best bet. The higher it goes the more likely there will be errors and you will shorten the life span. Personally, I try and keep them at the mid to low 70s because I don't want to be unlucky and have to crap out in 8 months or something. I am also going to buy a second Delta fan to augment it. These temps are very good considering there is only the one fan!
I don't have a komodo wallet yet but I will point it there if you give me a wallet address