16 Nov 2018, 10:39

That's why there is a Warning when you select Turbo/Extrem O/C.
There are many Pi manufacturers and they have all different quality checks. Some chineese manufacturers have no QC at all.

When playing with O/C options, I highly recommend to put a good cooling system (at least a large heatsink).
Sarting immediately with the Extrem mode is not a good idea. Start with the "High" mode, check if everything is fine, then try the next level and so on...