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Altering Apple EFI for Xeon microcode – jj

Altering Apple EFI for Xeon microcode


I have Mac Pro 3,1.
I have just bought 2x Xeon E5450 SLBBM E0 stepping and found that there are unsupported by my Mac Pro.

I tried to google for this problem and found that only SLANQ C0 stepping works with it.

SLANQ has CPUID 10676;

The MacPro 3,1 firmware has the microcode for the SLANQ (CPUID 10676).

Is it possible to edit MacPro 3,1 firmware and add support of SLBBM (CPUID 1067A)?

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