Results 1 to 11 of 11
  1. #1
    MDD Processor upgrade?
    Familyguy9877's Avatar
    Member Since
    Oct 06, 2010
    Posts
    116
    Specs:
    2008 Mac Pro 3,1: 3.2Ghz octo
    Cool MDD Processor upgrade?
    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.

  2. #2
    MDD Processor upgrade?
    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
    Posts
    31,466
    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.7.5
    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.

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  3. #3
    MDD Processor upgrade?
    Familyguy9877's Avatar
    Member Since
    Oct 06, 2010
    Posts
    116
    Specs:
    2008 Mac Pro 3,1: 3.2Ghz octo
    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.

  4. #4
    MDD Processor upgrade?
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    20,014
    Specs:
    iMac i5 2.7GHz, 16GB memory, OS 10.10.5
    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!

  5. #5
    MDD Processor upgrade?
    Familyguy9877's Avatar
    Member Since
    Oct 06, 2010
    Posts
    116
    Specs:
    2008 Mac Pro 3,1: 3.2Ghz octo
    Quote 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.

  6. #6
    MDD Processor upgrade?
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    20,014
    Specs:
    iMac i5 2.7GHz, 16GB memory, OS 10.10.5
    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!

  7. #7
    MDD Processor upgrade?
    Familyguy9877's Avatar
    Member Since
    Oct 06, 2010
    Posts
    116
    Specs:
    2008 Mac Pro 3,1: 3.2Ghz octo
    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?

  8. #8
    MDD Processor upgrade?
    Familyguy9877's Avatar
    Member Since
    Oct 06, 2010
    Posts
    116
    Specs:
    2008 Mac Pro 3,1: 3.2Ghz octo
    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?

  9. #9
    MDD Processor upgrade?
    Familyguy9877's Avatar
    Member Since
    Oct 06, 2010
    Posts
    116
    Specs:
    2008 Mac Pro 3,1: 3.2Ghz octo
    Picture of my MDD heat sync
    Attached Images Attached Images

  10. #10
    MDD Processor upgrade?
    Familyguy9877's Avatar
    Member Since
    Oct 06, 2010
    Posts
    116
    Specs:
    2008 Mac Pro 3,1: 3.2Ghz octo
    Sorry about the HUGE size

  11. #11
    MDD Processor upgrade?
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    20,014
    Specs:
    iMac i5 2.7GHz, 16GB memory, OS 10.10.5
    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!

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. MDD Processor upgrade?
    By Familyguy9877 in forum Apple Desktops
    Replies: 1
    Last Post: 12-18-2011, 04:23 PM
  2. PPC MDD HD upgrade questions
    By seedubxj in forum Apple Desktops
    Replies: 2
    Last Post: 11-04-2009, 07:04 PM
  3. Replies: 1
    Last Post: 09-20-2008, 12:42 AM
  4. G4 Powermac MDD Upgrade
    By Drew_Ty in forum Apple Desktops
    Replies: 2
    Last Post: 12-22-2005, 03:31 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •