----------  Original message  ----------
Subject: G4 processor upgrade
Date:    Dienstag 02 Februar 2010N
From:    John Carmonne <[email protected]>
To:      [email protected]

> Hi All
> I have a G4 MDD dual 1GB machine. I would like to install a G4 1.25 GHz
>  board. I know there is one of these processor's that will boot OS9, I need
>  that. Can someone  tell me If I can do this? Also how do I identify the
>  correct board? John Carmonne
> Yorba Linda USA

All MDD boards (that feature "only" FireWire-400) can boot Mac OS 9. All FW800 
boards (with the obvious difference) are not capable of booting Mac OS 9.

The Dual-1 GHz MDD has a bus speed of 167 MHz and can take any MDD or FW800 
CPU that is designed for the same bus speed.


133 MHz Bus speed:
MDD - 867 MHz Dual (1 MB cache on both processors)
FW800 - 1.0 GHz single (1 MB cache)

167 MHz Bus speed:
MDD - 1.0 GHz Dual (1 MB cache on both processors)
MDD - 1.25 GHz Dual (2 MB cache on both processors)
FW800 - 1.25 GHz Dual (1 MB cache on both processors)
FW800 - 1.42 GHz Dual (2 MB cache on both processor)
MDD - 1.25 GHz single (1 MB cache) "education only" 2003 model


Hope that helps,
Andreas  aka  Mac User #330250

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