Spot the difference - PowerBook G3 292mhz & 350mhz cpus.

AlpineRaven

New Tinkerer
Oct 9, 2025
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Spot the difference!

I recently bought this PowerBook G3 Wallstreet - very specific purchase because I had Sonnet 500mhz G3 card to go for it, it does not work in PowerBook G3 PDQ.

This is PowerBook G3 Wallstreet CPU, one is stock 292mhz and other one is 350mhz appears to be overclocked (overclocked from 292mhz to 350mhz), I thought I'd benchmark it - but it one came up very small amount difference.

Could you look in photos carefully and see what was changed/overclocked as I cannot work it out - both cards appears to be the same.

As you can see the multipliers on bottom left - R112 to R120 - those will be to multiply. On both CPU is the same.

also; bus speed multiply is R77 to R84 - one is for 83mhz and 66mhz - both CPUs are the same as both is 83mhz..

What I found about this 350mhz - it will not accept more than 256mb RAM as it will throw up memory error at boot up - Those memory cards are good working order as they're working in other CPUs.

Screenshot of the benchmark results.

Cheers
A
 

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