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Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

MDD Processor upgrade?


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Familyguy9877

 
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I have an MDD dual 1GHz, I am wondering if I could install a processor from a FW 800 model (1.25 DP) into this machine. I am almost positive thye both have the same bus speed (167MHz). also would the 1.0DP heat sync be good enough? I only want to do this because the dual 1.25 is like $15 on ebay and it would be a fun upgrade.
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Quote:
Originally Posted by Familyguy9877 View Post
I only want to do this because the dual 1.25 is like $15 on ebay and it would be a fun upgrade.
Not a lot of folks trying this sort of thing...so probably not much info out there on it. But if it's only $15...roll the dice...and do it.

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Familyguy9877

 
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Quote:
Originally Posted by pigoo3 View Post
Not a lot of folks trying this sort of thing...so probably not much info out there on it. But if it's only $15...roll the dice...and do it.

- Nick

I just want to be sure that im not going to fry anything in the process.
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The FW800 model uses a different mother board so you will be risking the machine for a minimal gain.

Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!
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Familyguy9877

 
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Originally Posted by harryb2448 View Post
The FW800 model uses a different mother board so you will be risking the machine for a minimal gain.
I probably wont since no one really knows if it could damage the machine.
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Have a read of this link and you would need to be 100% sure the to models have the same system bus speed.

https://discussions.apple.com/messag...44060?tstart=0

Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!
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Quote:
Originally Posted by harryb2448 View Post
Have a read of this link and you would need to be 100% sure the to models have the same system bus speed.

https://discussions.apple.com/messag...44060?tstart=0
"167 MHz Bus speed:
1.0 GHz dual w 1 MB cache (each processor) from Fw 400 model
1.25 GHz dual w 2 MB cache (each processor) from Fw 400 model
1.25 GHz dual w 1 MB cache (each processor) from Fw 800 model
1.42 GHz dual w 2 MB cache (each processor) from Fw 800 model
1.25 GHz single w 1 MB cache from "education only" 2003 model"

This is the info I need, 1GHz dual with 1Mb cache (My Factory MDD) and both 1.25 Dual processors have a 167MHz bus.
with the same bus speed and the same overall processor it should work just fine.
Am I right?
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I just came across a problem, as mentioned by the guy in the post you recommended some processors have 2 coils and some have 3, my MDD has only two, thus only room for two.
the only processor I could find cheaply has three coils and wouldn't work without a heat sink swap, my final problem, I do not have a different heat sink.

This makes me think though, I wonder if you could cut off a very small piece of the existing heat sink to make it fit on a processor with 3 coils?
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Picture of my MDD heat sync
Attached Images
File Type: jpg MDD heat sink.jpg (2.47 MB, 10 views)
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Sorry about the HUGE size
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I would leave it be as they are different sizes.

Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!
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