New RAM causing kernal panics

Discussion in 'iMac' started by mailliwwilliam, May 19, 2011.

  1. mailliwwilliam macrumors newbie

    May 19, 2011
    Hello, I'm new to Mac and new to the forum.

    I just bought a new 2011 27" iMac and the first order of business was to upgrade the RAM.

    I ordered 8gb of Crucial 204 pin SODIMM, DDR3 PC3-10600 and installed it into the the two open slots and left the original 2 x 2gb sticks in the factory location. Easy enough, took a couple of minutes to install and power up the Mac.

    I checked to ensure the 12gb was showing up under the "About this Mac" and it showed 12. I started opening items on the dock and Safari, App Store, and iTunes all had kernal panic's and would not open.

    After a couple attempts to ensure the ram was seated properly I changed locations of the RAM. I swapped the 2x4gb stick with the 2x2gb sticks and now everything is working fine.

    After researching the issue, I haven't found anything that says the higher capacity RAM has to be in a certain slot.

    Has anyone had this issue, or is it confirmed that higher capacity ram has to be in a certain slot? Or is it still a possibility the RAM I received is defective?
  2. phlydude macrumors regular


    Jun 21, 2010
    Newark, DE
    probably a seating issue if everything is working fine now...if you are getting errors again check to make sure you have the correct RAM and then call Crucial for defective replacement

    I don't have Crucial but installed G.Skill in the 2 open slots and have had ZERO long as you install in pairs, I don't think it matters where you install the larger capacity RAM, 1st or 2nd row

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