Harpertown 1333 mhz FSB CPU in a 2,1?

Discussion in 'Mac Pro' started by tpivette89, Mar 23, 2018.

  1. tpivette89, Mar 23, 2018
    Last edited: Mar 23, 2018

    tpivette89 macrumors 6502

    tpivette89

    Joined:
    Jan 1, 2018
    Location:
    Newark, DE
    #1
    Did both a google search and searched these forums and found no DEFINITIVE answer. What I found was a bunch of posts of people wanting to try this, others saying it either may or may not work, and then never concluding with actual testing.

    My question is this: would a Harpertown Xeon with a FSB of 1333 mhz work in a 2,1 flashed Mac Pro? Or is the X5365 ceiling the ABSOLUTE limit? Has anyone actually tried and failed, and if so, could you post a link to the results?

    The reason I am asking is I have access to a 1,1 which I plan on flashing to the 2,1 firmware... and as the Harpertowns in question with the 1333 mhz FSB are SUPER cheap (around $5 each), an experiment (even with the possibility of failure), is fine with me.

    EDIT: I did find a youtube video where one guy did try to install a X5470 (quad 3.33ghz) in a 1,1 without success. However, this was the E0 stepping (SLBBF), which is known to not work in even the 3,1. Perhaps the C0 stepping (SLA-variant) will fare better?
     
  2. 06tb06 macrumors regular

    06tb06

    Joined:
    Sep 12, 2017
    Location:
    2,711 miles from Apple Campus
    #2
    If you're only paying $5 for the chip itself then it's something you can try without worrying about breaking the bank. And if it doesn't work out, then just think of it as paying the same for a bad tasting Starbucks coffee.
     
  3. Morpheo macrumors 65816

    Morpheo

    Joined:
    Feb 26, 2014
    Location:
    Paris/Montreal
    #3
    There are no CPUIDs for 54xx’s in the 1,1/2,1 EFI. It won’t work. X5365 is the max for these Mac Pros.
     
  4. tpivette89 thread starter macrumors 6502

    tpivette89

    Joined:
    Jan 1, 2018
    Location:
    Newark, DE
    #4
    What about 52XX? There is a dual core Harpertown (X5260... 2 x 3.33 ghz) that I would like to try, also.
     
  5. Morpheo macrumors 65816

    Morpheo

    Joined:
    Feb 26, 2014
    Location:
    Paris/Montreal
    #5
    It's not harpertown, x52xx is wolfdale, and that's still a no-go. Clovertown x5365 is the most these macs can take.
     

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