56GB of RAM possible in 2006/2007 Mac Pro (1,1/2,1)?

Discussion in 'Mac Pro' started by Mr. Zarniwoop, Oct 15, 2014.

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  1. Mr. Zarniwoop macrumors demi-god

    Mr. Zarniwoop

    Jun 9, 2005
    Apple only supported 4GB FB-DIMMs in these models, for a total of 32GB RAM.

    However, the chipset was always suspected to support 64GB with 8GB FB-DIMMs, but everyone who tried this only had RAM recognized up to 32GB RAM.

    But today there's an interesting post on netkas of someone who used mostly 8GB FB-DIMMs and left two 4GB FB-DIMMs in the last two spots of the second riser.

    The apparent result? 56GB RAM in a MacPro2,1

    Very interesting if it really works properly.
  2. frostart macrumors newbie

    Oct 9, 2014
    This my message on netcas.org. I established this memory three years ago. I established 56 Gb only because any more there was no such memory.:) It was necessary to put two modules on 4 Gb for bank filling. I tested memory in TechTools 7 - everything normally. Sorry for my English.:)
  3. FireArse macrumors 6502a

    Oct 29, 2004
    This is very interesting - sadly my RAM supplier of choice (Crucial) no longer supply the part. Where are you recommending we buy RAM in the UK?
  4. profinite macrumors member

    May 1, 2009
    2006 Mac Pro (MacPro1,1)
    Flushed to 2,1 firmware
    Two Xeon X5355’s [Purchased February 25, 2014 for $45]
    Macosxbootloader v3.1
    64GB RAM (8 x 8GB) [Purchased November 18, 2015 for $199]
  5. nigelbb macrumors 65816

    Dec 22, 2012
    If you want 667MHz FB-DIMMs there are loads of cheap used parts on eBay pulled from Dell & HP servers. I have upgraded all three Mac Pro 3,1s in my household to 32GB & these parts will work in a 1,1 just fine. This is 32GB (8x4GB) from the US but they will ship to UK for about $50 all in (around £35) http://www.ebay.co.uk/itm/32GB-8x4G...973065?hash=item1ea3f83ac9:g:NikAAOSwcdBWTQGM
  6. balamw Moderator


    Staff Member

    Aug 16, 2005
    New England
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