iMac 27 suggested brands for RAM upgrade?

Discussion in 'iMac' started by mwfernandez80, Aug 1, 2011.

  1. mwfernandez80 macrumors newbie

    Jul 9, 2011
    I'm about to buy a new baseline 27 inch, and I am going to upgrade the RAM to 8 gigs.

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  2. mwfernandez80 thread starter macrumors newbie

    Jul 9, 2011
    Also, If I order two 4 gb SO DIMM's can I use them and the two 2 gb SO DIMM's that came with to make 12 gigs of RAM?

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  3. meli macrumors member

    Jun 3, 2004
    Yes. I'd put the new 4GB RAM into the slots originally occupied by the 2GB modules, then put the 2GB into the empty slots. From what I've read, the CPU accesses the top slots first, so you want the larger modules there. This configuration should keep dual-channel memory enabled.
  4. zarathu macrumors regular


    May 14, 2003
    From the apple support document, this is really not necessary to move the 2 gb chips as long as you are putting in two RAM chips in the empty slots. Now if you are only going to put in just one 4 gb chip, then you will need to move the 2-2 gb chips into the empty slots, and the one RAM chip into the on the two empty slots that you moved the 2 originals out of.

    If anyone can show a Apple support document that states the necessity of moving the original chips, I stand corrected.
  5. meli macrumors member

    Jun 3, 2004
    No, it's not necessary. I read, on, that there is some benefit to inserting the biggest memory modules into the the first slots as those slots are addressed first by the CPU. This could be incorrect, but it makes a certain amount of logical sense. And it will take about 60 seconds to move the RAM modules. And it definitely won't harm anything.
  6. g-boac macrumors 6502

    Oct 7, 2007
    Just curious, who actually makes the OEM RAM that Apple installs in their iMacs?

  7. meli macrumors member

    Jun 3, 2004
    Apple sources RAM from a few manufacturers. I've seen a few people report that their new iMacs have Samsung RAM.
  8. Stan Mikulenka macrumors 6502

    Nov 20, 2009
    Calgary, Canada
    Hi ferdandez,
    Apple uses the SAME RAM as everybody else...
  9. joudbren macrumors regular

    Apr 13, 2007
    Edmonton, Alberta, Canada
    My two week old i7 27" iMac came with Samsung brand ram. It didn't even have an Apple logo on the ram like they used to do. I purchased 16GB (4x4GB) sticks of Corsair brand ram locally for $130 total and working perfectly so far. Keeping the original Samsung ram on a shelf just in case I need it for warranty issues. Cheers!
  10. schaffinosx macrumors member

    Jul 29, 2011
    When I upgraded my computer's RAM, I went with Crucial. Didn't have any troubles with the company, got the RAM, and it all worked out great.

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