Dual 1.25 Ghz processor swap into 867 quicksilver?

Hey… I know this is going to sound like an odd question, BUT… I am considering upgrading my 867MHz Quicksilver processor, and tried a 1.5GHz upgrade chip from OWC. It didn't give me the performance boost I was hoping for. I have an opportunity to take the processor out of a dual 1.25GHz Mirror Drive Door PowerMac G4… is it possible to place the processor & heat sink from this machine in my older 867? I think the dual has a 167 bus vs my slower 133 bus, so I don't know if that's a problem. Thanks in advance for the help!

Hi
unfortunately processor cards from MDD G4s aren't compatible with Quicksilver (and earlier) G4s as they use slightly different architectures and possibly even different processor sockets. That's partly why OWC (and other third party) processor upgrades cover models from the AGP/Sawtooth G4s upto the Quicksilver 2002 G4s, but aren't compatible with the MDD or FW800 G4s.
The fastest 'Apple original part' upgrade would be a dual 1GHz from a Quicksilver 2002. I swapped my single 800MHz for a dual 1GHz (pulled from another Quicksilver) and the difference in performance was very worthwhile.
Having said that though, most benchmarks show a dual processor G4 is around 40% faster than a single processor running at the same clock speed, so I'm not sure a dual 1GHz would be much (if any) faster than a single 1.5GHz. Also which ever processor upgrade you choose, you're still stuck with the same relatively slow 133MHz system bus, which will impact real world performance.
I hope this helps.

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