3.2 quad cMP memory query

Discussion in 'Mac Pro' started by Salient, Dec 10, 2014.

  1. Salient macrumors newbie

    Oct 25, 2013
    After months of indecision and some great advice from those here, I've finally got hold of a 3.2 quad core cMP mid-2012 in mint condition and have absolutely no buyers remorse - its perfect for my needs but needs upgrading.

    I want to max out the RAM to 32gb but Crucial's website has me confused - their advisor tool for my specific machine takes me to the following page but only has 4gb modules:


    They also say a mid-2012 quad can accept these PC3-12800 1.35v modules. Can anyone confirm if they will work?

  2. Umbongo, Dec 10, 2014
    Last edited: Dec 10, 2014

    Umbongo macrumors 601


    Sep 14, 2006
    1.35v modules won't give 1333MHz when you use 4 of them. Crucial don't seem to have 8GB 1333MHz DDR3 ECC DIMMs in their store any more.

    You want these:


    Or if the value branding puts you off:


    Faster memory downclocks appropriately so if you would rather buy from Crucial then you want one of these:

    No ECC: http://uk.crucial.com/gbr/en/memory/ct102464ba160b
    Unbuffered ECC: http://uk.crucial.com/gbr/en/memory/ct102472ba160b

    There is no reason to buy unbuffered or registered over the other from a performance stand point (not in the Mac Pro anyway) so just get the cheapest you are happy with. I'd get the Kingston.

    edit: just recalled the Xeon W3565 only supports 1066MHz memory anyway, but I'd still get 1333MHz+ if you ever want to upgrade. Crucial only do Quad-Ranked DIMMs at 1066MHz and they aren't cheaper.

    Also you have options on eBay like this: http://www.ebay.co.uk/itm/32GB-4x8G...erComponents_MemoryRAM_JN&hash=item462c378067

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