RAM Latency - CL7 vs CL9?

Discussion in 'iMac' started by honcho, Jul 12, 2011.

  1. honcho macrumors newbie

    Joined:
    Apr 19, 2011
    #1
    I'm just waiting on my new 27" 3.4GHz i7 iMac to arrive. In preparation, I have been shopping around for an extra 8GB of RAM to add to the base 4GB.

    Should I be looking to get CL7 or CL9 1333MHz memory? I've read various answers but I'm still not clear about whether the latency timings makes a difference.

    Any suggestions would be greatly appreciated. Thanks!
     
  2. Hellhammer Moderator

    Hellhammer

    Staff Member

    Joined:
    Dec 10, 2008
    Location:
    Finland
    #2
    There is no CL7 1333MHz DDR3, only CL6 and CL9. There is no need to pay more for lower latency since it's very unlikely that you will notice something. Just go with CL9.
     
  3. honcho thread starter macrumors newbie

    Joined:
    Apr 19, 2011
    #3
    That's probably why I was confused. I couldn't find any CL7 so-dimms (apart from Geil gaming ones). Thanks for that, Hellhammer.

    It looks like it's the Crucial 8GB 1333MHz CL9 Kit for me then :)
     
  4. Iroquois macrumors newbie

    Joined:
    Jul 1, 2011
    #4
    Ram is measured in nanoseconds. Its physically impossible for you to notice any difference.
     
  5. honcho thread starter macrumors newbie

    Joined:
    Apr 19, 2011
    #5
    My real concern was compatibility rather than shaving a few seconds off a Handbrake encode. Great to know I'll be fine with the CL9 sticks. Thanks.
     
  6. MythicFrost macrumors 68040

    MythicFrost

    Joined:
    Mar 11, 2009
    Location:
    Australia
    #6
    I don't think you'll notice the difference so go with CL9.
    Actually there is :p

    G.Skill 2x2GB 1333MHz 7-7-7-21

    You can even get 1600MHz CL7 (7-8-7-24), although it's pricey.
     
  7. Hellhammer Moderator

    Hellhammer

    Staff Member

    Joined:
    Dec 10, 2008
    Location:
    Finland
    #7
    Hmm, then it's missing from this table (or there is a typo, the 6 should be 7).
     
  8. MythicFrost macrumors 68040

    MythicFrost

    Joined:
    Mar 11, 2009
    Location:
    Australia
    #8
    It could be a typo or it could be missing. CL8 is also missing. The fastest RAM available today well exceeds 2000MHz, too.
     

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