LGA 771 Xeon Microcode – How to MOD Your BIOS

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In this guide, we'll cover how to add the LGA 771 Xeon microcode to your BIOS. This is sometimes necessary for people doing the LGA 771 to 775 MOD.

How will updating the microcode help?

It can restore missing CPU instructions

If you did the LGA 771 to 775 MOD and notice missing CPU instructions (such as Speedstep, SSE 4.1, VT-x, or CompareExchange128) adding the Xeon microcode will usually restore that functionality.

It can also improve system stability

Microcode updates usually fix bugs or add new features, so by updating the microcode, you can sometimes make your system more stable.

LGA 771 Xeon microcode guides

Important: Make sure you do a FULL BIOS reset after updating your microcode.

If you have an Award, Phoenix, or AMI BIOS, the guides shown below should cover everything you need to know to add the LGA 771 Xeon microcode to your BIOS.

How can I tell what type of BIOS I have?

You may see the BIOS type when you turn on your computer or enter the BIOS. If you don't, you can use a program called CPU-Z to look this up (it should be listed as BIOS Brand in the Mainboard tab).

Note: AMI is short for American Megatrends Inc., so you may also see it listed the long way.

LGA 771 Xeon microcode files

Note: You don't need to download any of these files if you're using one of the guides shown above (they already have the correct microcode files).

  • Desktop LGA 771 and LGA 775 microcode
    • If you're trying to add LGA 771 Xeon support to an LGA 775 motherboard, this is the recommended file to download. It will allow you to not only add the LGA 771 Xeon microcode to your BIOS, but you can also update your processor's similar LGA 775 microcode (which is probably a good idea).
    • Contains microcode for all Core 2 Duo and later desktop processors (no Pentium 4 or mobile support).
    • Also contains the LGA 771 microcode shown below.
  • LGA 771 microcode

When you unzip one of these files, you'll see a bunch of individual microcode files that have filenames like this:

cpu0001067a_plat00000044_ver00000a0b_date20100928.bin

Here's what the different parts of the filename mean:

  • cpu0001067a - 1067A is the CPUID that is supported by this microcode
  • plat00000044 - plat is short for platform. This tells which sockets are supported by the microcode.
    • LGA 771 microcodes have a 4, 40, or 44 in this section
    • Desktop LGA 775 has a 1, 10, or 11
    • And for mobile LGA 775 it's a 20, 80, or A0
  • ver00000a0b - a0b is the version number
  • date20100928 - 2010-09-28 is the date the microcode was last updated

Which microcode files should I set aside?

You'll want to set aside all of the microcode files with your processor's CPUID (how to get the CPUID). There should be at least one of these for each platform, and you should go ahead and update the microcode for all of the platforms that you want your motherboard to support.

Note: If your CPUID ends in an "h" and you don't see microcode with an "h" on the end, just ignore the "h" because it isn't actually part part of the CPUID. That just means it's a hexadecimal number.

Example

So for our E5450 (E0 stepping SLBBM) with a CPUID of 1067A, here are the LGA 775 and LGA 771 microcode files with a CPUID of 1067A:

  • cpu0001067a_plat00000011_ver00000a0b_date20100928.bin
  • cpu0001067a_plat00000044_ver00000a0b_date20100928.bin

If you have that processor and want to add the LGA 771 microcode and update LGA 775 microcode (which is recommended), you'd want to set aside both of these files.

What to do if you don't have an Award, AMI, or Phoenix BIOS

Insyde BIOSes

If you have an Insyde BIOS, there's a more advanced guide on manually hex editting a BIOS to add microcode. It is available here.

Intel BIOSes

We don't currently know of any microcode updating guides for Intel BIOSes. We've also heard that Intel may be using a secure checksum to prevent people from modifying them. If this is the case, it would prevent the manual hex editing method used for Insyde BIOSes.

Dell BIOSes

Dell often makes their BIOS updates available in an .EXE file that cannot be extracted by regular unzipping programs, so you'll need to use the trick shown below to extract it.

How to extract the BIOS ROM file from a Dell .EXE file

You can extract the actual BIOS from a Dell .EXE file with the following command:

DellBiosFilename.exe /writeromfile

This needs to be done from a DOS command prompt window.

Other BIOSes

If you have a different type of BIOS, you may be able to update the microcode by manually hex editing the BIOS. If you're interested in trying that, read the Insyde BIOS modding guide.

You may need to update the microcode in multiple places

If you're hex editing your BIOS to update the microcodes, we've noticed that some BIOSes have the same microcode in multiple places. If that's the case with your BIOS, make sure you update the microcode in all of the locations. Otherwise, it may not work.

Where to go for help

If you have questions about updating an Award, AMI, or Phoenix BIOS, leave a comment at one of the guides mentioned earlier.

If you need help with a different type of BIOS, we recommend asking for help at the following places: bios-mods.com, overclock.net, or forums.mydigitallife.info.

161 Responses

  • Алексей August 8, 20184:57 pm

    Здравствуйте у меня материнская плата intel DG33FB помогите модифицировать биос под 771 сокет

    Reply
  • Андрей August 17, 201811:34 am

    Добрый день Алексей,

    вашей материнской карты среди протестированных нет, ближайшая материнская карта которую тестировали была Intel DG33FBC

    https://www.delidded.com/lga-771-to-775-adapter/3/#intel

    исходя из сопровожающей записи CPU Xeon E5450 и Xeon X5460 не запустились.

    В секции о совместимости есть следующая записка относительно материнских плат компании Intel
    ———————————————————————————————————
    Issues with Intel brand motherboards

    Note: This information only applies to motherboards actually manufactured by Intel. We haven’t heard of any problems with ASUS, Gigabyte, MSI, or any other brands.

    Some motherboards made by Intel don’t work with this mod
    For some reason, some Intel brand motherboards that have a compatible chipset and support a similar LGA 775 processor do not work with this mod (please see the list of tested motherboards for the model numbers).

    It may not be possible to update the CPU microcode on an Intel brand motherboard

    This is sometimes needed to install Windows 8.1 64-bit or to enable all of the CPU features (like Speedstep, SSE 4.1, or VT-X). The older non-E0 stepping processors often don’t need a microcode update to enable these features, so if you do try it, buy one of those.

    The reason this may not be possible is because Intel has their own proprietary BIOS that nobody currently knows how to MOD (even by manually hex editing the BIOS).
    ———————————————————————————————–

    Совместимость материнских карт для модификации BIOS

    https://www.delidded.com/lga-771-to-775-adapter/2/

    Возможно кто-то вам сможет дать больше информации относительно модификации BIOS для вашей материнской карты.

    Вебсайт уже модифицированных BIOS для материнских карт Gigabyte и Asus

    http://tanieprocesory.pl/en/bios2-2/

    другой вебсайт с модифицированными BIOS (организация веб страницы требует улучшения)

    http://genius239239.myweb.hinet.net/771/

    Андрей

    Reply
  • TommyTosser August 28, 201810:02 am

    I’ve also installed a Xeon on a 775 socket.

    But I’ve got a strange problem.

    The motherboard is an ASUS p5kpl-am epu and the CPU is an X5450 3.00Ghz.

    Everything works fine, it boots up, the bios recognizes the CPU, windows too.

    The thing is it doesn’t work past 2.50Ghz… What could be causing this?

    Its also working hot, close to 70ºc.

    Reply
    • M. September 1, 20188:07 pm

      Most likely thermal throttling

      Reply
  • arevalosk5 September 13, 201810:00 am

    Hola. Compré un procesador Intel Xeon E5450 en un Aliexpress, que, de acuerdo con la descripción TDP 80W Comprado para la instalación en la placa madre Biostar G41D3C Ver. 7.0., Que de acuerdo con la especificación: CPU máxima TDP (potencia de diseño térmico): 95 vatios.
    Revisé el BIOS para instalar Xeon. Al inicio se muestra el mensaje: La potencia máxima de la CPU sobre 95W. Prepárese para apagar … cuenta desde 8 segundos y se apaga.
    La pregunta es, como hago para solucionar este problema?

    Reply
  • Rayhan October 4, 20189:30 am

    I downloads microcode and mmtools from here, mmtools can run Properly. Microcode are bin files ican’t open with mmtools when i change .bin to .rom mmtools becomes error what should i do?

    Reply
  • Rayhan October 4, 20189:36 am

    I downloads microcode and mmtools from here, mmtools can run Properly. Microcode are bin files ican’t open with mmtools when i change .bin to .rom mmtools becomes error what should i do?
    I use ecs g41-m12 motherboard

    Reply

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