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Early Mac Pro does not recognise ram in Riser A

463 Views 5 Replies Latest reply: Feb 13, 2013 3:21 AM by Bad Ram RSS
Bad Ram Calculating status...
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Feb 9, 2013 5:32 AM

System information shows that I have only 8Gb of ram installed when it should show 14Gb, there appears to be no ram installed on Riser A even though I have 6 GB of ram on the card. Assuming that the issue was the card on which the ram was installed I swopped the card from Riser B which has the 8Gb on and put it in Riser A and the 6Gb in Riser B. System Information now shows that only 6Gb is installed so I think it can be assumed that the cards and the ram chips are OK.  So is this a hardware or software issue?


I recently had to replace the Grphics Card as the old one died could this have resulted in some damage to the motherboard.

Mac Pro (Early 2008), OS X Mountain Lion (10.8.2)
  • Johnb-one Level 3 Level 3 (680 points)
    Currently Being Moderated
    Feb 9, 2013 12:23 PM (in response to Bad Ram)

    all I can give you is my 2cents. I have the same kind of Mac pro you do, and here's what did it for me: There is a certain way to install the Ram modules, the mac pro "prefers' it like that.  Usually matched pairs. You could also try

    here is a link to apple's installation diagram


    maybe the riser is bad, but that could be premature...I may be wrong


    anyways, follow the diagram and you may be successful... I think you may have to shut down the Mac pro before swopping risers.... then again, you may have bad ram, or not



  • The hatter Level 9 Level 9 (58,595 points)
    Currently Being Moderated
    Feb 11, 2013 6:40 AM (in response to Bad Ram)

    The top slot for a Riser then, even after replacing with a new one?


    And where did you buy the new Riser?


    Whose RAM?


    What graphic card? you had 7300GT and put an ATI 5770 in and connected the power cable w/o trouble?


    DVWarehouse is one of two places I am aware of that sells quality Mac Pro parts.


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