Resolved Third memory stick died in my Mac Pro 2008 !

Discussion in 'Mac Pro' started by Spacedust, Feb 16, 2012.

  1. Spacedust, Feb 16, 2012
    Last edited: Feb 19, 2012

    Spacedust macrumors 6502a

    May 24, 2009
    This started to be annoying. I was having 8 sticks of Micron FB-DIMM's 800 MHz each 4 GB = 32 GB total with small heatsinks. To cool them down I've installed Zalman BGA heatsinks on top of them.

    5th April 2011 - first stick died, replaced with Hynix
    29th November 2011 - second stick died, replaced with Kingston
    16 Februrary 2012 - third stick died, about a month before I've replaced all Zalman aluminium heatsinks with high-end copper Enzotech Heatsinks.

    What's going on with this Micron ?

    My current temps are as follows:

    Is this too high for FB-DIMM ?
  2. ashman70 macrumors 6502a

    Dec 20, 2010
    What program do you use to read the temps of the memory?
  3. 666sheep macrumors 68040


    Dec 7, 2009
    I have 8 Samsung sticks with non Apple sinks and they run over 2 years (24/7), even a little hotter than yours, without issues. You may have a bad luck I guess. Could you post a pic of these Enzotech sinks?
  4. Spacedust thread starter macrumors 6502a

    May 24, 2009
    I got these sticks since January-February 2010.

    I've used HWMonitor on Windows 7. The funny thing is that CPU-Z is still able to read SPD from this faulty stick.

    I would like to buy one stick of CSX memory with large heatsinks but is it 2Rx4 ?

    Here is the Enzotech's gallery:




    Can you tell me if Samsung is 2Rx4 ? Hynix and Kingston pair great together with Micron.
  5. Spacedust thread starter macrumors 6502a

    May 24, 2009
    I just ordered one stick of Nanya on eBay in preety good price :)
  6. Spacedust thread starter macrumors 6502a

    May 24, 2009
    I booted my Mac Pro today with this faulty stick and bam - 32 GB RAM is back again and working normally, no errors detected. What was that ? Did it fixed itself ?
  7. ActionableMango macrumors G3


    Sep 21, 2010
    Intermittent problem. Keep an eye on it.
  8. gpzjock macrumors 6502a

    May 4, 2009
    Memory America FTW
    I use this kit, they have HUGE heatsinks and a lifetime warranty, no replacement blues for me.
    I bought 2 sets of 4 x 2GB over 2 years, I'm running 16GB total. They run hot at 65ºc - 85ºc but don't really mind apparently.
    Had 1 x 2GB stick go bad in 2009 they replaced all 4 of the 2 matched pairs I bought it in, no quibbles. Had another stick go in the 2nd set of matched pairs in 2010, yet again full replacement of all 4 and only paid the postage. Both replacement sets have been fine since (about 18 months).
    Can't beat it! Lovin' it. :D
  9. Spacedust thread starter macrumors 6502a

    May 24, 2009
    I've moved it into different slot today and it's not working with red LED. Good I got Nanya today.

    It will a perfect pair with my Hynix because it has the same specs:


    and my 5 Micron's and 1 Kingston is 5-5-5-18-22.


    I've moved it again and it working...

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