Purchased a 400mhz G3 ZIFF Upgrade CPU but after installation G3 Still reports 266Mhz

speakers

Tinkerer
Nov 5, 2021
98
76
18
San Jose, CA
peak-weber.net
...
They might have added -5V with the Beige, but it seems farfetched.

Neither Beige or B&W have -5V. Here's the pinout for both:
Pinout.jpg