It appears as if Intel is not very happy that overclockers have been able to get less expensive Intel Celeron G900’s and Intel Core i3-12100’s to run at much higher clock speeds than what they intended. Maybe Intel is anticipating that they might lose sales of more expensive CPUs for these lower-end CPUs. In any case Intel has issued a warning via Tom’s Hardware that “Intel’s 12th Gen non-K processors were not designed for overclocking. Intel does not warranty the operation of processors beyond their specifications. Altering clock frequency or voltage may damage or reduce the useful life of the processor and other system components, and may reduce system stability and performance.”
It appears as if you can overclock lower-end non-K Alder Lake chips as long as you have a motherboard that has the BCLK unlock feature in the BIOS. Professional overclocker der8auer was able to overclock the Intel Celeron G900 to 5.338 GHz, a 57% overclock!
It seems the BCLK unlock is only available on costly Z690 motherboards, but it appears that some B660 motherboards will get this feature in upcoming BIOS updates.