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i5 2550k overclocking causes KP in AICPM, need help


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Hi Everyone

my CPU is i5 2550k and mobo is Asrock Z77 Extreme6.

My mobo's bios has been patched by PMPatch. My Hackintosh works properly with SSDT on stock frequency.But if I overclock it to 4.2Ghz, It KP in AICPM with P-State Stepper error like this pic

There are also some other problems. My i5 2550k should turbo boost at 3.8GHz but the max P-State is only 37 instead of 38If I do not use any SSDT, the system will kp again with the same error. The SSDT file is generated by ssdtPRGen and the P-state from 16-42 looks like no problem. 

my smbios is macmini5,3.
So can anyone help me with this problem?

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