How to disable Hyper Threading on 10.7?

Discussion in 'Mac OS X Lion (10.7)' started by Oppressed, Jul 24, 2011.

  1. Oppressed macrumors 65816


    Aug 15, 2010
    Reaching out to all the developers out there. I'm interested in finding the CPUPallet preference panel that use to be either located under /Library/Application Support/HWPrefs/CPUPalette or under the extras folder in the developer tools. Both locations are gone.

    If anyone knows where I can find this preference panel again I would greatly appreciate it.
  2. Madd the Sane macrumors 6502a

    Madd the Sane

    Nov 8, 2010
    Wirelessly posted (Mozilla/5.0 (iPod; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5)

    Why do you want to disable hyperthreading?
  3. gglockner macrumors 6502


    Nov 25, 2007
    Bellevue, WA
    Sorry for the long delay in replying...

    In Snow Leopard, there were three ways to disable HT on-the-fly. As far as I can tell, none of these work in Lion. However, you can permanently disable hyperthreading by issuing the following command in the Terminal:

    sudo nvram SMT=0

    To re-enable hyperthreading, use the command:

    sudo nvram -d SMT

    Changes will take effect when you reboot.

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