MP 1,1-5,1 Changing Apple EFI for Xeon microcode

[alexffff]

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
SLBBM has CPUID 1067A

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)?

 

[LightBulbFun]

this is something I have personally wanted to try but I sadly lack a MacPro3,1 (or Xserve2,1) to try it with

I recommend checking out this thread of mine https://forums.macrumors.com/threads/updating-a-mac-pro-s-cpu-microcode.2114187/

 

[alexffff]

this is something I have personally wanted to try but I sadly lack a MacPro3,1 (or Xserve2,1) to try it with

I recommend checking out this thread of mine https://forums.macrumors.com/threads/updating-a-mac-pro-s-cpu-microcode.2114187/

Do you or somebody else know if I can run not MacOs with these unsupported CPUs but Ubuntu or other Linux without any changes in EFI?

 

[reukiodo]

Regardless of OS, you will need to update the microcode in the firmware before the computer will even boot with those CPUs installed.