Riikcakirds wrote on 2024-08-05, 18:30:

Was is true all Intel P120/133 CPUs (used .35um process, same as P200) from 1995 have the BF1 pin internally disconnected to […]
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Was is true all Intel P120/133 CPUs (used .35um process, same as P200) from 1995 have the BF1 pin internally disconnected to prevent
overclocking to P150/166/200 (basically they disabled the 2.5 and 3.0x multiplier setting).
I acquired a box of around 30 P120s and P133 with dates from '95-96 and trying the 2.5 or 3 multiplier on difference socket 7 boards has the effect of changing the multiplier to 1.5 or 2x settings.
I guess intel didn't want someone running a P133 @ P166/P200 in 1995 before the newer chips were even released.

Nothing on Intel is universally true

https://www.cpu-world.com/forum/viewtopic.php?t=21991

120mhz SX994 -> C2 stepping -> 0,60 micron (old one)

The early p120s were many times socket 5 only and bf1 wasn’t invented yet and “voltage reduction technology and power saving “ were only found on newer 120’s

P133’s sometimes were wired up socket 5 only, a few had both pins working

Even though p133 worked on most socket 5 systems it was considered the first socket 7.

Very early socket 5 boards sometimes lacked a multiplier pin making them only good to 100mhz.

And bus overclocking works even if the multiplier is locked. Some early socket 5 had bus speeds above 66mhz allowing you to overclock.