What Ram to order with the new 2019 IMac?

Discussion in 'iMac' started by Potts17, Mar 20, 2019.

  1. Potts17 macrumors newbie

    Joined:
    Mar 20, 2019
    #1
    So what RAM package is everyone ordering? Assuming 32gb? What brands/model #’s do you recommend? Just ordered the 27” with 8gb of factory ram.
     
  2. sandylp, Mar 20, 2019
    Last edited: Mar 21, 2019

    sandylp macrumors 6502

    sandylp

    Joined:
    Jul 10, 2004
    Location:
    San Francisco Bay Area
    #2
    I ordered: 64.0GB (4x 16GB) PC4-21300 DDR4 2666MHz SO-DIMM 260 Pin Memory Upgrade Kit for 2019 iMac models which utilize PC4-21300 SO-DIMM from macsales.com You can also order 32GB in either 2x16GB or 4x8GB.
     
  3. macduke macrumors G4

    macduke

    Joined:
    Jun 27, 2007
    Location:
    Central U.S.
    #3
    I ordered this: https://smile.amazon.com/Crucial-16GBx2-PC4-21300-SODIMM-260-Pin/dp/B071H38422

    It’s $30 cheaper than MacSales and seems to be the correct speed and pin layout. Furthermore people seem to have had no problem installing it into the new Mac Mini and I’ve had good luck with Crucial in the past. Make sure you keep your 8GB because there are four slots. Then you can have matched channel pairings to get full speed at 40GB, which is what I’m doing.
     
  4. adamjackson macrumors 68000

    Joined:
    Jul 9, 2008
    #5
    Remember too, the iMac 27" has 4 SO-DIMM slots so you can keep the two matched pairs of 4GB Ram (8GB) and add 32GB for a total of 40GB. I'll go 64GB if and when I actually need that much RAM. Have 32GB on my MacBook Pro and sometimes start to touch the ceiling but it happens so infrequently that I think 32GB is more than most people will ever functionally need except for VR/Science Modeling or massive video projects.

    32GB for $199 + 8GB included is 40GB and is a ton (as of this writing in 2019, don't quote me in 10 years on my statement).
     
  5. Fishrrman macrumors P6

    Fishrrman

    Joined:
    Feb 20, 2009
    #6
    Buy the new iMac with 8gb of RAM (for now).
    Sit back 4-6 weeks until "RAM issues" become known (if they are to become known).

    THEN consider buying more RAM...
     
  6. shaunp macrumors 68000

    Joined:
    Nov 5, 2010
    #7
    I'd wait for the reviews/issues to become public, then order the lowest amount of RAM and buy the additional RAM from Crucial at half the price Apple will charge for essentially the same RAM.
     
  7. macduke macrumors G4

    macduke

    Joined:
    Jun 27, 2007
    Location:
    Central U.S.
    #8
    The RAM I linked to above from Crucial doesn't seem to have any issues with the 2018 Mac Mini that uses the same 2666MHz speed and even works in older 2017 iMacs that came with 2400MHz. I'd be pretty shocked if I have any issues with what I purchased. You guys can use me as a guinea pig if you want, but I can always send it back if it has problems and it's only $199. I don't think I could get by for very long on 8GB, lol.

    Also, it looks like someone asked them and the manufacturer responded on Amazon:

     
  8. SaSaSushi macrumors 601

    SaSaSushi

    Joined:
    Aug 8, 2007
    Location:
    Takamatsu, Japan
    #9
    Crucial is an excellent choice. It is, after all, the consumer division of Micron, Apple's primary vendor. I've seen far fewer reports of issues with Crucial than OWC over the years in these forums.
     
  9. shaunp macrumors 68000

    Joined:
    Nov 5, 2010
    #10
    There won't be issues with the RAM, that wasn't what I was referring to when I said 'issues'. I was referring to the iMac. so far an 8-core CPU in that iMac case is untested - it could thermal throttle a lot, or it could be okay. Wait for the reviews before ordering
     
  10. remiller macrumors newbie

    remiller

    Joined:
    Mar 22, 2019
    Location:
    USA
    #12
    Planning purchase of 32 gb RAM, 2 x 16gb, from OWC. Would use the two stock 4gb modules as well for total 40gb RAM. My question is which slots to use for each of these? I guess these need to be paired in some way. In which slots should the larger modules be placed?
     
  11. adamjackson macrumors 68000

    Joined:
    Jul 9, 2008
    #13
    If you add two 16GB sticks in the two empty slots to an 8GB iMac, you'll have 40GB. They are 4 slots, two matched pairs so

    Two 4GB Sticks
    Two 16 GB Sticks
    =40
     
  12. eatmyjustice macrumors member

    eatmyjustice

    Joined:
    Mar 24, 2008
    Location:
    Washington, USA
    #14
    Thanks for the link... I just ordered this too.
     
  13. Crylex macrumors newbie

    Crylex

    Joined:
    Mar 24, 2019
    Location:
    Philippines
    #15
    Hi guys! Need your help. I just ordered a BTO iMac 27" and I want to buy another 32gb ram for it.
    The problem is I do now know which is compatible and which is not. Its my first time having a mac and upgrading a ram.

    I checked the internet and found these:

    OWC 32GB Ram ~ 230 USD
    https://eshop.macsales.com/item/OWC/2666DDR4S32P/

    Crucial 32GB DDR4 2400 MHz SO-DIMM Memory Module Kit ~ 199 USD
    https://www.bhphotovideo.com/c/product/1346254-REG/crucial_ct2k16g4s24am_32gb_kit_16gb_x2.html

    G.Skill SODIMM 32GB ~ 230 USD

    I honestly do not know which is the better option among those 3 so please help me. And if you can suggest a different one, please do so.
    Appreciate all the help! Thank you!
     
  14. sandylp, Mar 24, 2019
    Last edited: Mar 24, 2019

    sandylp macrumors 6502

    sandylp

    Joined:
    Jul 10, 2004
    Location:
    San Francisco Bay Area
    #16
    You need The DDR4 2666 MT/s (PC4-21300) DR x8 Sodimm 260 - Pin Memory. Looks like the most inexpensive place is Amazon. https://www.amazon.com/Crucial-16GBx2-PC4-21300-SODIMM-260-Pin/dp/B071H38422?pldnSite=1
     
  15. Rockadile macrumors 6502

    Joined:
    Jun 11, 2012
    #17
    Put the larger RAM modules where the stock ones were.
     
  16. SaSaSushi macrumors 601

    SaSaSushi

    Joined:
    Aug 8, 2007
    Location:
    Takamatsu, Japan
    #18
    So long as the matching DIMMs are installed in alternating slots (dual channel) it makes no difference which set goes where in terms of performance.

    I added 32GB (2x16GB) to my 2017 iMac and benchmarked it with no difference aside from a marked decrease when the matching DIMMs were not in proper dual-channel configuration.

    You can just put the new modules into the empty slots.
     
  17. Rockadile macrumors 6502

    Joined:
    Jun 11, 2012
    #19
    Since I was going by a PC motherboard manual, by all means put the new ones in the empty slots if there are no difference with a iMac logic board.
     
  18. mikey8811 macrumors member

    Joined:
    Mar 23, 2019
    #20
    On the base 27 in iMac, it says the maximum RAM is 32 Gb.

    I was initially thinking of keeping the 2 x 4 Gb that comes with it and adding another 2 x 16 Gb for 40 Gb in total later like some of you have done here. I presume that isn't possible.

    So I presume if I wish to keep the original RAM, the best that I can do is add another 2 x 8 Gb for a maximum of 24 Gb? is this correct?

    Thanks
     
  19. curmudgeonette macrumors 6502

    Joined:
    Jan 28, 2016
    Location:
    California
    #21
    The "limit" is simply because Apple doesn't want to provision base model machines with maximum memory. This would be an SKU that sells very little. The base model is also not available with an i9 CPU nor the biggest Fusion drive.

    Go right ahead and upgrade to 40GB.
     
  20. millerrh macrumors 6502

    millerrh

    Joined:
    Sep 14, 2005
    #22
  21. jonatious, Mar 26, 2019
    Last edited: Mar 26, 2019

    jonatious macrumors member

    jonatious

    Joined:
    Sep 29, 2016
    #23
  22. charliedread macrumors newbie

    Joined:
    Mar 26, 2019
    #24
    Can I use the ram 2400 from the previous imac and mix it with the 2666 in the new 2019 imac? I heard you can but the 2666 is going to get downclock to 2400.
     
  23. Chancha macrumors 6502a

    Joined:
    Mar 19, 2014
    #25
    Off on a Hong Kong forum, some guy's iMac already arrived.
    The stock RAMs are 4+4GB sticks of SK hynix HMA851S6CJR6N-VK
    PC4-21300 2666MHz 1.2V 0.75ns CL19
     

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182 March 20, 2019