2019 iMac RAM 2400MHz

Discussion in 'iMac' started by jonatious, Apr 4, 2019.

  1. jonatious macrumors member

    jonatious

    Joined:
    Sep 29, 2016
    #1
    I purchased this following RAM
    https://www.amazon.com/gp/product/B06XRBS4Y5
    This RAM Is CL16 and I remember someone mentioning that the stock RAM is CL19. So is this discrepancy what causes the speed to go down to 2400MHz?

    In that RAM someone has commented this
    Is this something possible on iMac? Or my only option is to return this RAM and buy a CL19 RAM? Lower the latency should be better right?
     
  2. Rockadile macrumors 6502

    Joined:
    Jun 11, 2012
    #2
    The RAM's base speed you purchased is 2400MHz with overclocking ability to 2666MHz. Since there's no XMP profile option in Mac, you have to return it.

    This one should work at 2666MHz: https://www.amazon.com/Crucial-16GB...+sodimm&qid=1553736676&s=gateway&sr=8-1-spell
     
  3. curmudgeonette macrumors 6502

    Joined:
    Jan 28, 2016
    Location:
    California
    #3
    Looking through the Amazon page, buried in middle is the phrase: "Speeds start at 2400 MT/s." This is merely 2400 MHz (PC-19300) RAM that can be overclocked to 2666 MHz on systems where you can configure that in the BIOS.

    Regarding the "16 clocks": To compare clock delays, they need to be compared at the same clock frequency. Increasing frequency requires increasing the clock delay. 16 clocks @ 2400MHz is about 18 clocks @ 2666MHz. Also, 19 clocks @ 2666 Mhz is about 17 clocks @ 2400 MHz.
     
  4. jonatious thread starter macrumors member

    jonatious

    Joined:
    Sep 29, 2016
    #4
    Thanks guys, I did not realize that, I will order the Crucial one. Are there other options though? I can only see the Crucial one which has CL19 latency
     
  5. rugby4all macrumors newbie

    rugby4all

    Joined:
    Mar 30, 2019
    #5
  6. Crispy Duck macrumors regular

    Joined:
    Nov 14, 2006
    Location:
    Manchester, UK
    #6
  7. rugby4all macrumors newbie

    rugby4all

    Joined:
    Mar 30, 2019
    #7
    Not that expensive here in the US only 10-15% difference! At almost double the price I wouldn't recommend it but I had good experience in the past with OWC, hence being a repeat customer.
     
  8. Crispy Duck macrumors regular

    Joined:
    Nov 14, 2006
    Location:
    Manchester, UK
    #8
    Ah I see. I was logged into my Amazon account and it took me to the UK prices. I've ordered the Crucial RAM from Amazon.
     
  9. Rockadile macrumors 6502

    Joined:
    Jun 11, 2012
    #9
  10. Brookzy macrumors 601

    Brookzy

    Joined:
    May 30, 2010
    Location:
    UK
  11. rychencop macrumors 65816

    rychencop

    Joined:
    Aug 17, 2007
    Location:
    South Carolina
    #11
    OWC is the way to go when it comes to Mac RAM. IMHO ;)
     
  12. donkuok macrumors newbie

    donkuok

    Joined:
    Apr 14, 2019
    #12
    Possible to remove the stock 8gb ram and check the RAM speed again? I believe the CAS Latency of ballistic one is CL17 and the stock one is CL19.
     
  13. crapthings macrumors newbie

    Joined:
    Mar 17, 2010
    Location:
    Harbin

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12 April 4, 2019