iMac 2019 Intel 9th Gen CPU Steppings

Discussion in 'iMac' started by JacobHarvey, May 22, 2019.

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  1. JacobHarvey, May 22, 2019
    Last edited: May 22, 2019

    JacobHarvey macrumors newbie

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    #1
    Just curious to see if anyone's 2019 iMac with an i5-9600K or i9-9900K has come with the newest R0 stepping which includes a few extra hardware fixes for various security vulnerabilities (e.g. additional Spectre variants, Fallout etc.). The earlier P0 stepping will still get software fixes for these

    See: https://www.intel.com/content/www/u...ngineering-new-protections-into-hardware.html

    The original P0 stepping 9th Gen CPUs will be labelled as "Intel64 Family 6 Model 158 Stepping 12" while the newer R0 will have "Stepping 13". Intel's CPUID tool (https://software.intel.com/en-us/download/download-maccpuid) or a standard terminal command will reveal this info.

    Terminal command: sysctl -a | grep machdep.cpu

    I just purchased an i5-9600K iMac (thanks to all on this forum who provided detailed performance info and screenshots before I purchased one myself!). Mine was from a retailer and is a Stepping 12 (P0).
     
  2. priitv8 macrumors 68040

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    #2
    Mine is manufactured 15 of April and has stepping 12.
     

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  3. codernova macrumors member

    codernova

    Joined:
    May 13, 2019
    #3
    MacCPUID reports not a single difference for me.
     
  4. JacobHarvey thread starter macrumors newbie

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    #4
    From the other thread your iMac was manufactured not long ago so it seems like it'll take a while before we see 9th Gen CPU iMacs with the new stepping shipping to customers.
     

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3 May 22, 2019