You think its true ?

Discussion in 'Mac Pro' started by Grenadier, Jan 15, 2007.

  1. Grenadier macrumors regular

    Nov 12, 2006
    Crucial states that it is possible to put non-ECC RAM into a ECC system (Eg: The Mac Pro).
    Do you think this is true ? Does this mean I can just go with the stock RAM, and then later replace it myself with Standard and rather cheap DDR2 instead of expensive ECC FB-DIMM modules ? (Albeit I will have to get rid of the stock RAM when replacing since apparently, you cannot put ECC and Non-ECC in a system)
    Could someone confirm/deny this for me ?
  2. aaronw1986 macrumors 68030

    Oct 31, 2006
    Not sure. The safest thing to do would be call Apple...
  3. mkrishnan Moderator emeritus


    Jan 9, 2004
    Grand Rapids, MI, USA
    Apple has a site that specifically lists non-ECC as okay for almost every Mac EXCEPT the Mac Pro... Also other sites have discussed in some detail the need for the specific FB modules with the big heatsinks. Anyway, I'd be fairly careful, even though Crucial is usually good about identifying what you need....
  4. slughead macrumors 68040


    Apr 28, 2004
    crucial has been messing up a lot recently on the mac pros--shipping the wrong ram, normal heatspreaders (no big heat sinks as in the pics), etc.
  5. omfgninja macrumors member

    Aug 9, 2006
    wont work
    FB-DIMM's work in different ways than standard memory. I believe all thouse RAM sticks have an extra memory microcontroller to have it work in serial, or something.
    I forget extactly, but im almost 100% sure that you can only use FB-DIMMs in a Mac Pro.
  6. ChrisA macrumors G4

    Jan 5, 2006
    Redondo Beach, California
    Lots of technical reasons why this will not work. The first thing you will notice if you try is that the Mac Pro uses 240 pin RAM while the standard DDR2 is 200 pins so it will not physically fit into the slot (unless you use a really big hammer which or course might void the warranty.)

    In general, in the past, in some non-Apple computers you could put non-ECC ram into machine designed for ECC RAM. The way this works is they made "fake" ECC RAM. ECC RAM had a bit that sent either "good" or "bad" and they simply hard wired it to always send "good" even i the RAM was not. On PCs there used to by "Fake parity" RAM that would compute rather then store the parity bit. Basically the same idea -- send "good" no matter what.
  7. Grenadier thread starter macrumors regular

    Nov 12, 2006
    I see.

    Do you think though that by any chance Fake-ECC RAM would work ?
    And would it even be worth it ? (By that I mean, would it be THAT much cheaper ?)
  8. swiftaw macrumors 603


    Jan 31, 2005
    Omaha, NE, USA
    If you're spending all that money on a Mac Pro I wouldn't risk performance by using dodgy RAM, isn't it kind of like buying a Ferrari then using low-octaine gas?
  9. tyr2 macrumors 6502a


    May 6, 2006
    Leeds, UK
    I'd be amazed if 'Fake-ECC' even existed in the FB-DIMM format.

    Also I don't think there's a Non-ECC version of FB-DIMMs even if you wanted to go that way. At least I've not come across any.

    It's a Mac Pro you just have to fork out the extra costs for FB-DIMMs there's nothing you can do about it really.
  10. Grenadier thread starter macrumors regular

    Nov 12, 2006
    Understood. Its a pity, but Ill just have to live with it.
    Well, thank you for your time gentlemen.

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