crucial ddr2 4200 or 5400 for imac 2.1ghz?

Discussion in 'Buying Tips and Advice' started by derthballs, Nov 11, 2005.

  1. derthballs macrumors member

    Joined:
    Oct 25, 2005
    #1
    im trying to order 1gb ram upgrade for my new iMac, but the config thingy on crucial says i could have either the 4200 or 5400, but im not sure what ram is in mine, ive had a search and people say to use crucial because the imac is fussy, but im none the wiser and want to match the speed of the existing one, i dont want to pay for the 5400 if its only 4200 in there already.
     
  2. derthballs thread starter macrumors member

    Joined:
    Oct 25, 2005
    #2
    any ideas guys?
     
  3. tremewan macrumors newbie

    Joined:
    Nov 1, 2005
    #3
    As a "soon to buy iMac" followed by a "soon to upgrade RAM in new iMac" person, I'm curious for an answer to this one as well. According to the Crucial site, however, the choice seems to be between a 4200 and a 5300 (rather than 5400). Sorry to be picky Derthballs! :confused: :confused: :confused:

    Update!!!! I may have just answered my own question. On checking the Crucial site again (and clicking on the "Crucial Recommends" button) it came up with the 4200 stick. Suits me - it's nearly five quid cheaper than the 5300!!! Still like to know the difference though (in non-tecky simpleton's language, please!)
     
  4. carlos700 macrumors regular

    Joined:
    Dec 17, 2004
    Location:
    Omaha NE
    #4
    The difference is megahertz 4200 runs at 533MHz, 5300 runs at 667MHz

    Looking at the FSB for the 2.1GHz model which is 700MHz, I do not see why 667MHz RAM wouldn't work. Although it may speed down to 533MHz…
     
  5. tremewan macrumors newbie

    Joined:
    Nov 1, 2005
    #5
    Thanks Carlos. I guess that means paying the extra for the 5300 may be a false economy as it may not perform any better than the 4200 (which Crucial recommended anyway)?
     
  6. Bear macrumors G3

    Joined:
    Jul 23, 2002
    Location:
    Sol III - Terra
    #6
    The memory bus in the iMac can't change the speed it runs at, so buying the 5300 memory wouldn't buy anything.

    What would matter is the "CL=" number - the lower the number here, the faster the memory can spit out data.
     
  7. FFTT macrumors 68030

    FFTT

    Joined:
    Apr 17, 2004
    Location:
    A Stoned Throw From Ground Zero
    #7
    iMacs are a bit picky about RAM specs.

    I'd stay with the exact factory specifications.

    Datamem has DDR 2 PC4200 1 GB sticks for $99.00
     

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