I am using MacPro 5,1 sambas and don't want to change it to other due to iCloud and iMessage log in issue.
I have been modifying IOPlatformPluginFamily.kext to use macmini5,1 speedstep for my i5-2500k and was working.
However, now with Yosemite, it won't boot with such kext.
I can load modified kext such as applertc, applehda, AGPM, etc but this kext won't load nor applied to kernel cache.
because of this, my system is stuck at 3.4GHz.
Thanks in advance.