Does PC3L-8500R RAM work with a Mac Pro 2009?

Discussion in 'Mac Pro' started by Okta, Mar 17, 2018.

  1. Okta macrumors newbie

    Apr 20, 2014

    I have a Mac Pro 2009 (4,1) with dual Xeon 2.26 Processors. My friend has an HP Proliant Server with a beastly amount of RAM in it he's willing to sell to me at under 1/3 of the cost of what buying this amount of RAM would cost from OWC.

    I would like to fill up all the slots with 16GB DIMMs (128GB of RAM!) though I read Mac will only recognize 96GB of RAM.

    Here are the specs of the RAM:

    Samsung M393B2K70CM0-YF8 16GB 4Rx4 PC3L-8500R-07-10-F0-D2

    Bus Speed: 1066MHZ DDR3-1066/PC3-8500
    ECC Registered
    CL7 CAS Latency Timings
    Quad Rank X4

    I guess the biggest question is, will it work?

    I did some research but I wasn't able to find anything to tell me. I'm sorry if this question has been asked before.
  2. h9826790 macrumors G4


    Apr 3, 2014
    Hong Kong
    PC3L-8500R is fine, CL 7 is also correct. However, 4Rx4 may cause issues.

    The 96GB limit was long long time ago. Yosemite was confirmed can boot with 160GB RAM (32GBx5).

    The real limitation of "non dual rank" memory is unknown. In some case, the DIMM may run slower if all slot filled. In some case, can only boot with limited slots used (but not all slots filled).

    It sounds like your friend willing to sell you 16GBx8 for about $200. In this case, you may just buy the DIMM from him, and try to boot from them. If the result is acceptable (e.g. can boot with up to 6 DIMMs), then you may leave the remaining two as backup, or sell them.
  3. Okta thread starter macrumors newbie

    Apr 20, 2014
    Great guess! That's exactly it.

    Weird, thank you for the analysis. I'll buy them and report back :)
  4. Okta thread starter macrumors newbie

    Apr 20, 2014
    It worked!

    It's running at 800MHz but it's 128GB of RAM.

    Thank you :)

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