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LGA 771 Xeon Microcode How to MOD Your BIOSOctober 6, 2014 December 2, 2018 MODs 196 Comments Share ! 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. Note: Microcodes are current as of 2018-12-02 (source). They were last updated by Intel on 2015-08-02. Table of Contents
How will updating the microcode help?It can restore missing CPU instructionsIf 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 stabilityMicrocode 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 guidesImportant: 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 filesNote: 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).
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.binHere's what the different parts of the filename mean:
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. ExampleSo 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:
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 BIOSInsyde BIOSesIf 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 BIOSesWe 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 BIOSesDell 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 fileYou can extract the actual BIOS from a Dell .EXE file with the following command: DellBiosFilename.exe /writeromfileThis needs to be done from a DOS command prompt window. Other BIOSesIf 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 placesIf 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 helpIf 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. Share ! syn Leave a comment |