G4 processor swaps

[Bunsen]

http://www.jcsenterprises.com/Japamacs_ ... ssors.html

An excellent page on compatibility of G4 CPU modules between different models.

From theos911's post here.

[MacJunky]

If I may also add:
You can use Sawtooth/Gigabit Ethernet CPUs in a Digital Audio without any changes at all. Apple System Profiler may say it is running slow but other programs can generally detect it properly. (I have personally tested this, including changing the resistors and running benches) The only issue is that you are running a really slow CPU and the bus gets dropped down to 100MHz but it is good for testing a suspect motherboard or CPU.
I have not tried in a QS, but the QS is similar enough to teh DA that it *should* probably work. ymmv

[Bunsen]

Thanks macjunky. I'll add your tip to the Peripherals Links Project.

/ETA/ Darn it, wouldn't you know. The link in the OP has disappeared. Trying to dig up an archive copy now.

/ETA/ Nope, it's gone

[theos911]

It seems to be working fine for me.

I also have a copy in my backups, just in case.

[Bunsen]

Great! Must have just been down when I looked at it. Added to Links Project.

[CJ_Miller]

Also one can swap MDD and G4 Xserve processors. The heatsinks and mounting hardware differ but the cards are the same.

[CelGen]

You can use Sawtooth/Gigabit Ethernet CPUs in a Digital Audio without any changes at all.

Not for dual CPU modules. In a Digital Audio G4 the Dual module overlaps all of the RAM slots and the mounting holes are backwards.


To go dual in the Digital Audio you need modules that work in the Quicksilver. Looks like the same module, but almost mirror oppisite.

[MacJunky]

It does look like the CPU card would cover the RAM slots in that case, I never did look into the duals.

and the mounting holes are backwards.

but how can the mounting holes be backward when you have two on either side of the connector and one on the other side of the CPU? (unless you are rotating the card, but it could never actually connect in that case.)

Actually, I should mention that a single CPU Sawtooth/GBE heatsink blocks one of the RAM slots in a DA/QS but the other two remain open.
http://www.poopr.org/images/uieyoazu70zugrg7q8ll.jpg
IIRC it is only the heatsink, so you could trim it if you were *really* desperate. but this is really only good for testing or a very dire emergency.

[z180]

Has someone here fitted a 7455 MDD module into the G4 Digital Audio?

[volvo242gt]

It should work, if you're talking about the single 1.25GHz module. It looks almost identical to the OWC Mercury Extreme 1.2GHz 7455 module I have for my DA. The dual module won't work, due to it covering the RAM slots.

-J

[waynestewart]

MDD CPUs don't work in anything else and CPUs from other G4s don't work in a MDD. It's been tried repeatedly and no one has ever reported success

Has someone here fitted a 7455 MDD module into the G4 Digital Audio?

[Macdrone]

I second the MDD issue. Its a different bus speed.

[ClassicHasClass]

MDD CPUs don't work in anything else and CPUs from other G4s don't work in a MDD.

... except, as mentioned, the Xserve, but that's because the Xserve is really just a pumped-up MDD in a funny box.