PC8500 RAM in 5.1 instead of PC10600?

Discussion in 'Mac Pro' started by goodfidelity, Nov 23, 2016.

  1. goodfidelity, Nov 23, 2016
    Last edited: Nov 23, 2016

    goodfidelity macrumors member

    Nov 15, 2015
    Is it possible to use PC8500 RAM in the 5.1 12-core machines instead of PC10600?

    What problems can occur other then slower speed?

    What about 4.1 upgraded to 5.1 with 6-core processors, will it work good with 8500 RAM?

    The ram sticks work fine in the machine, but i have only testet for short period. Dont want problems coming down the road since the macine is for another user.


    This page states it works, but that Apple dows not support it. What Apple supports or not doesnt matter to me. Just what works or not.


    So if you know that there can be negative experience from this combination, please take your time to post about it.

  2. h9826790 macrumors G4


    Apr 3, 2014
    Hong Kong
    Should be just little bit slower and most likely you can't feel anything at all.
  3. goodfidelity thread starter macrumors member

    Nov 15, 2015
    Yeah, i read that its not even possible to measure the difference.

    But i heard someone tell me that it might be problems further down the road. But dont know anyone who tried it.

    So if anyone has experience, positive or negative, of running 8500 RAM in last generation of 6-core or 12-core machines i would be very happy to share this info.

  4. chriz_r macrumors member


    Nov 10, 2016
    I've never encountered a problem running slower ram, nothing that I could even detect. Even running different speeds (and the whole setup dropping to the 8500) it's still not noticeable. RAM is already very fast so other components would be a bottleneck before ram speed becomes an issue.

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