Yes, it can. It is the Motherboard that limits the booting, particularly the 
firmware and drivers in the OS. The processors are still just 7544/7457 series 
processors. I have seen people do this before. Mine, I just took the dual 1.25 
board and overclocked it to dual 1.5. :P

On Feb 2, 2010, at 12:46 PM, Dan Knight, LowEndMac.com wrote:

> I have a question that I hope someone here can answer. Can a 1.42 GHz
> dual CPU module be transplanted to a FireWire 400 MDD motherboard
> while still allowing booting into Mac OS 9?
> 
> Thanks!
> 
> Dan Knight, LowEndMac.com
> 
> On Feb 2, 12:23 pm, "Mac User #330250" <macuser330...@gmx.net> wrote:
>> 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.
> <snip>
>> 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
> 
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