Are 4gb RAM sticks physically bigger?

Discussion in 'iMac' started by minusten, Oct 21, 2009.

  1. minusten macrumors member

    Mar 17, 2009
    Apart from the obvious difference in screen size, the 2nd and 3rd imacs in the new range appear identical with the exception of the fact that the larger one takes 16gb RAM, the other only 8gb. So are 4gb RAM sticks physically bigger, or does Apple ensure the hardware won't recognise more than 8gb in total to keep the machine at the lower end in terms of upgradeability?
  2. sammich macrumors 601


    Sep 26, 2006
    No. The 27" iMac's have an extra 2 slots for RAM. That's why you can have double the maximum RAM. 4 GB is the biggest stick you can get today.
  3. maghemi macrumors 6502

    Aug 7, 2009
    Melbourne Australia
    All SO-DIMM DDR3 ram sticks are the same physical size not matter what capacity they are.

    That is what's used in the new iMacs.

    The smaller one has two ram slots. ie 2x4gb = 8gb
    The bigger one has four ram slots. ie 4x4gb = 16gb

    As has been said 4gb is the largest capacity ram chip currently available in SO-DIMM.
  4. minusten thread starter macrumors member

    Mar 17, 2009
    But the BTO page on the 21.5s shows 4x2GB as an option for the same price as 4x2GB in the 27s. That's my point, why not 4x4 if 4x2 will fit?

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