On Mar 8, 2012, at 11:10 PM, Wayne Stewart wrote:
You can easily swap CPU modules between MDDs with the same bus speed.
You can also do it between MDDs with different bus speeds but you need
to do some resistor mods to get the best results or in some cases to
work at all
Taking out a dual 1.25 and replacing it with a single 1.25 is just
plug and play
Your dual 1.25 will have a 2mb cache while the single will have a 1mb
so a dual running on one processor should still be faster than a
single.
Let me throw a bizarre idea out there that no one else would likely
ever want to do. The dual processors clock speeds are individually
set. Why not set the unused processors clock speed to the lowest
possible speed. I think that would be 333mhz
Thanks for that great reply Wayne!
I was beginning to believe that it could not be done. That there was
some reason that prevented swapping the single G4 CPU module for use
on the dual G4 motherboard.
Now, another question is will the dual G4 CPU module work on the
single G4 motherboard? As I am trying to trade G4 CPU modules with an
owner of a single 1.25GHz G4 MDD PowerMac, it won't be a good trade if
he can't use my dual 1.25GHz G4 CPU module.
Your idea of changing the clock speed of the unused G4 to its slowest
speed (333MHz), is an interesting option and might be less work and
trouble. My only concern there is the possibility of messing up my
perfectly working motherboard by having two different speeds running
on these G4 CPU's. I would be willing to bet no one has tried it
before, so no one would know what side effects it might cause.
If it is a simple matter of removing, or reconfiguring some resistors
on the CPU module to slow down just one of the two G4's, I could try
it on the dual 1.25GHz G4 CPU module and keep my dual 1.42GHz G4 CPU
model untouched, in case anything went wrong.
Anyone else have any comments on this crazy idea? See my original
post on this topic for details of what I am trying to do. Thanks
David
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