Slow Radeons 7xxx+ on MacPro3,1

It’s known for a while that GCN radeons are low performers on 2008 MacPro using OSX 10.9

And the reason for this is…..


Apple fucked up some CPU power management resulting in videocard not running properly. plz fix.

Just remove AppleIntelCPUPowerManagement.kext and AppleIntelCPUPowerManagementClient.kext if you like to workaround it, speedstepping still works, cpu isn’t hot/cosuming a lot, still drops the clocks.



  1. May 28th, 2014 | 4:48 pm

    Is it only the 2008 (3,1) model or the 2009/2010 (4,1/5,1) as well?

  2. Georg
    September 5th, 2015 | 1:39 pm

    This is also true for OS X 10.10.5, MacPro 3,1 and Radeon R9 280X. Its now 3x and more faster.
    Thanks for the tip!

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