https://www.youtube.com/watch?v=wsKjX6UGYUQ
Intel was so pissed someone else was making money on binning they locked multiplier on later 133/166/200, all Pentium MMX and later models ending easy overclocking.
https://forums.anandtech.com/threads/pentium-200mhz-multipli...
Except the classic case of the Celeron 300a which let you go from 300Mhz to 450Mhz with a simple change of a motherboard FSB clock setting.
I was nervous when I ordered the parts - but stunned that it was so easy for me to do, and left me with a machine that was effectively faster than anything Intel was officially selling at the time.
For an interesting, albeit slightly unrelated read, see:
https://en.m.wikipedia.org/wiki/Chip_art
>"Prior to 1984, these doodles also served a practical purpose. If a competitor produced a similar chip, and examination showed it contained the same doodles, then this was strong evidence that the design was copied (a copyright violation) and not independently derived."
