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  1. #1
    Which RAM of these 2?

    Member Since
    Nov 02, 2012
    Posts
    377
    Specs:
    iMac 21.5" 2.5 i5 8G RAM OS X 10.10.3 (12C60)
    Which RAM of these 2?
    I want to add 4 GB of RAM memory to my iMac mid-2011 i5 21.5".

    What's the difference between these two? (Results from Corsair's memory finder tool.)



    Corsair Mac Memory — 4GB DDR3 SODIMM Memory Kit (CMSA4GX3M1A1333C9) single stick

    Corsair Mac Memory — 4GB Dual Channel DDR3 SODIMM Memory Kit (CMSA4GX3M1A1066C7) single stick



    Difference I see is 9-9-9-2-4 or 7-7-7-2-0 between the two, repectively; what do these figures mean?


    Also, is there any advantage to having 1 stick of 4 GB vs. 2 sticks of 2 GBs?

  2. #2
    Which RAM of these 2?
    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
    Posts
    31,466
    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.7.5
    Purchase from OWC or Crucial…it's much easier!

    - OWC
    - Crucial

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  3. #3
    Which RAM of these 2?
    Raz0rEdge's Avatar
    Member Since
    Jul 17, 2009
    Location
    MA
    Posts
    8,184
    Specs:
    27" i7 iMac, 24" iMac, 13" Macbook Air, iPhone 5 & 5S, iPod Nano 7th Gen, iPad 2 16GB WiFi, iPad 3
    OWC sells memory especially for Macs and they list the following options for your iMac..

    Looking at the specifics, the memory has CL: CAS 9-9-9-24, so the Corsair memory you found that matches these Cas/Latency settings would be the one that I would recommend..
    --
    Regards
    ...Ashwin



    Be sure to read the Community Guidelines | The more information you provide, the better answers you get, remember GIGO.

  4. #4
    Which RAM of these 2?
    bobtomay's Avatar
    Member Since
    Dec 22, 2006
    Location
    Texas, where else?
    Posts
    26,206
    Specs:
    15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '11 1.8 i7 4GB 10.10; 21" iMac '13 2.9 i5 8GB 10.10; 5s & 5c
    Plus one of them is 1333Mhz and one is 1066Mhz.

    Your iMac uses 1333Mhz memory, aka PC3 10600 DDR3 SO-Dimms.

    OWC or Crucial are much easier.
    I cannot be held responsible for the things that come out of my mouth.
    In the Windows world, most everything folks don't understand is called a virus.

  5. #5
    Which RAM of these 2?

    Member Since
    Nov 02, 2012
    Posts
    377
    Specs:
    iMac 21.5" 2.5 i5 8G RAM OS X 10.10.3 (12C60)
    All right, so this appears to be what I need and according to them 2 2g sticks are better than 1 4 g (on top of my installed 2 X 2 Gs).



    OWC 1333DDR3S04S 4.0GB (2x2.0GB Kit) PC3-10600 DDR3... in stock at OWC

    (Wow, memory sure is cheap these days!)

  6. #6
    Which RAM of these 2?
    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
    Posts
    31,466
    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.7.5
    Quote Originally Posted by dotdotdot View Post

    (Wow, memory sure is cheap these days!)
    Depends what computer the ram is for. 4gig (2 x 2gig) for your iMac is $21.99…4gig (2 x 2gig) for my MacBook is $55.97.

    Sounds like you found what you needed…congrats!

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  7. #7
    Which RAM of these 2?
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    20,025
    Specs:
    iMac i5 2.7GHz, 16GB memory, OS 10.10.5
    This is what you want for a kid 2011 iMac:-


    Memory up to 32GB for Apple iMac 2011 Thunderbolt equipped models
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  8. #8
    Which RAM of these 2?

    Member Since
    Nov 02, 2012
    Posts
    377
    Specs:
    iMac 21.5" 2.5 i5 8G RAM OS X 10.10.3 (12C60)
    Got my RAM in (added 4 to the 4). As expected, no change in speed but with only 7 tabs running (of ordinary websites) this thing is consuming 5Gs of it. I don't know where it's all going. Now I wish I had gone for more (almost).

  9. #9
    Which RAM of these 2?
    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
    Posts
    31,466
    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.7.5
    Quote Originally Posted by dotdotdot View Post
    Got my RAM in (added 4 to the 4). As expected, no change in speed but with only 7 tabs running (of ordinary websites) this thing is consuming 5Gs of it. I don't know where it's all going. Now I wish I had gone for more (almost).
    Adding ram to a computer does not always result in any sort of speed increases. You had 4gig of ram to begin with (which really is not all that bad). If you only had 1 or 2 gig of ram...and went to 4 or 8gig...then you would probably have seen more of a performance increase (snappiness).

    In the average users case...going from 4 gig to 8gig of ram simply helps to insure that no single application is "starved" for ram. And with 8gig of ram...you can open more apps...with less of a chance of a decrease in performance.

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  10. #10
    Which RAM of these 2?

    Member Since
    Nov 02, 2012
    Posts
    377
    Specs:
    iMac 21.5" 2.5 i5 8G RAM OS X 10.10.3 (12C60)
    I've noticed that it now devotes much more space to "inactive". So with 3 website tabs running, and after surfing all day, 3.74 is inactive. As I understand it, it holds in memory pages I might re-visit. This is unique to Macs I assume.

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