[Request] Apple Mac Pro A1481 Intel mcu modding

[juliuscaesar10]

Hello friends. I’m new here. I am from Brasil and we repair Apple machines.

Recently I start a new “project” and I’m not sure if it’s possible.

I have a Mac Pro A1481, that we call “lixeirinha”, from trash basket.

The BIOS only support CPU Xeon E5 v2 family. But these processor only support AVX.

I need to install a CPU that supports AVX2, with limitation of DDR3 RAM. I find the Intel Xeon E7-8891 v3 that supports DDR3 yet. But my problem is the microcode.

The BIOS contain only the microcode of Xeon E5. I want to insert the E7 microcode, or replace another thats not in use.

I tried to follow 2 tutorials but, apparently, Apple BIOS is diferent.
I’d appreciate any tips. Thank you.

[GUIDE] Update CPU Microcode + Fix FIT Using UEFITool / Hex

Update CPU Microcode + Fix FIT Using UEFITool / Hex This is a quick requested guide I put together for someone, on how to edit CPU microcoded with UEFITool and how to update/correct the FIT table in some BIOS. There is already a guide here on how to update microcodes using these very same methods, which includes a brief section on correcting FIT table, but some users have asked for a little more info/guidance on how to do both of these things especially FIT corrections… So here is my method o…

AMI INTEL CPU Microcode Update Guide

[**********. Caution: Possible outdated content ********** ] [GUIDE] AMI INTEL CPU Microcode Update Guide Edit: Use this guide with caution and possibly if you have flashback feature or usb rom programmer available just in case. If possible try using MMTool ‘CPU-Patch’ feature instead as it is a whole lot easier. For now as of 1/31/2021 have discovered issues that require further investigation with the advanced method. Use only as last option when all others fail. I am writing this gui…

Edit by Fernando: Thread moved into the “CPU Microcodes” Category and title customized

[MeatWar]

@juliuscaesar10

…and we repair Apple machines.

[LH1394]

Update microcode with MMTool, the best way.

[juliuscaesar10]

@MeatWar I opened on UEFITools and found 8 sections from microcode type.

There is no option to replace body. I don’t know how I insert this information.

Besides, I have 2 volumes of microcode, each one with 128 kb. My new CPU microcode has 254 KB.

I tried to insert the new CPU code from HxD into my BIOS, replacing the code, but no succes.

Any tips?

[MeatWar]

@juliuscaesar10

Any tips?

I dont know any “UEFItools” but i do know this repo:
LongSoft/UEFITool: UEFI firmware image viewer and editor

now as you’re an Apple Machine “repair man”, i do advise to read it and see available tools and functions on versions released, i’m sure you’ll get there.

[juliuscaesar10]

That’s right. I misspelled the name