LGA 771 to 775 Adapter (MOD) – Run faster Xeon CPUs in a Core 2 Quad motherboard


If you're looking to extend the life of your LGA 775 system, there's an adapter available now that will let you install faster (and usually cheaper) Intel Xeon processors (LGA 771) into a Core 2 Quad motherboard (LGA 775). These Xeons cost a lot less and are basically identical internally to the high-end Core 2 Quad CPUs.

List of LGA 771 & 775 CPUs + Current Prices

The pages shown below should help with comparing Xeon prices and specifications. The first link has all the LGA 771 and LGA 775 CPUs combined into 1 table (sorted by price), and the others are the original uncombined pages.

Where can I get an adapter?

Here's a current list of sellers (sorted by price). The sellers are located all over the world, so you should be able to find one that's close to you, and most of them will also ship worldwide.

Why would you want to do this?

Xeons are usually MUCH cheaper

For example, the Xeon E5450 is equivalent to a 3.0 GHz Core 2 Quad Q9650, and it currently costs about $35 (about $70 less than the Q9650).

Other good deals on LGA 771 Xeons include:

For detailed specs on all of the Xeons and a full list of current prices, take a look at this page.

Xeons also typically overclock better

Additionally, if you’re interested in overclocking (making the cpu go faster than its default speed), Xeon processors are usually made from the best silicon, so you can typically achieve higher overclocks with them.

Someone that recently did this mod successfully overclocked a Xeon X5470 from 3.33 GHz to 4.5 GHz on an ASUS P5Q PRO motherboard, so you can achieve really good results with these Xeons.

How does the adapter work?

The adapter is basically an electronic circuit on a sticker, and you place it on the Xeon processor (as shown in the picture below). This switches two of the pads on the bottom of the Xeon to make it compatible with a Core 2 Quad motherboard.

Xeons that are compatible with this adapter

This adapter is only compatible with LGA 771 Xeon processors. If you're unsure what LGA 771 means, it's the name of the CPU socket used in some Xeon motherboards. And in comparison, LGA 775 is the name of the socket used in Core 2 Duo/Quad motherboards.

LGA 771 to 775 Adapter

Minor modification to the LGA 775 socket is also required

If you look at the LGA 775 socket in the picture below, you'll notice two tabs are circled in red. These tabs are there to stop you from installing a non-LGA 775 processor, and they'll need to be fully removed before you can install an LGA 771 cpu.

The tabs are pretty easy to remove if you have a sharp utility knife or box cutter (just be careful not to damage or bend any of the socket pins near the tabs).

Important: Make sure that you fully cut off each of these tabs. If they're not fully cut off, the processor may not align or seat correctly in the socket, which will stop it from making contact with all of the pins. If this happens, your system will likely fail to boot.

Once the tabs are cut off, you can use tweezers to safely remove the pieces from the socket.

The socket will then support LGA 771 or 775 processors (you can still reinstall your old processor if you ever need to).

Tabs to removed from the LGA 775 socket


Leave a reply
  1. Pinks

    Hi :)

    I’m confused, I have P5G41T-M LX with LGA775, and I want to install Xeon E3110 by site http://www.cpu-world.com/CPUs/Xeon/Intel-Xeon%20E3110%20-%20EU80570KJ0806M%20-%20AT80570KJ0806M%20(BX80570E3110).html it’s to 775 do i have to cut socket? I didn’t saw him on list, so I ask if it possible to install it? And install all microcode?

    Many thanks for help :)

  2. doodie

    GA-P43-ES3G(modded BIOS) upgraded with pre-soldered and cutted E5450 C0 confirm working! Win8.1 64 Pro running smoothly and everything is stable so far no issue. Very happy with the upgrade. TYSM for the guide!!!

  3. Pascal

    Thanks for this fabulous forum

    GIGABYTE P35C-DS3R bios F12 confirmed working with Intel Xeon X5260, E5430 C0 E0, E5450 C0 (and 2*4G DDR3)
    ASUS PK-VM bios 0903 confirmed working with Intel Xeon E5430 with addeded microcodes
    MSI P35 Platinium bios v1.12 confirmed working with Intel Xeon E5430

    great job

    • DjErase


      I upgraded my P5QL Pro Bios 1004 (with or Without Xeon Microcode) with an E5450.
      Everything is starting but it’s impossible to install x64 Windows 8, 81 & 10 Tec Preview.

      At the start of the install (Windows flag and small circles) it stays all the time at this screen and nothing happened.
      I tested memory, …. and also booting from a Windows XP PE and all is running fine.
      It’s only a prob with the installation of Windows.
      I tested it with no patched and patched BIOS 1004, it’s the same. My Core2Duo E8500 is working fine on it.

      I move the SATA to another machine and preloaded it with Windows 7 x64, it’s the same thing, blocked at the Windows Startup screen.

      If somebody has information this should be fine.


  4. Headrush

    Mobo: GigaByte EP45-DS3P with Microcode BIOS update
    CPU: Xeon E5450 3GHz Harpertown 333*9
    Step: A
    Rev: E0

    Forgot to reset BIOS but it reset itself and it works fine anyway, passed Intel CPU Diag tool, thank you for an excellent guide :)

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Problem with this MOD? Please read the troubleshooting section before reporting a problem. If that doesn't help, please tell us all of the things you've already tried.

Unsure about compatibility? Please read the motherboard compatibility and tested motherboards sections of this guide.


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