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 $22 (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

1,366 Responses

  • ProndT July 16, 20161:03 pm

    Gigabyte GA-G31M-ES2L REV 2.0
    Xeon X5460 (C0)

    • ProndT July 19, 20168:47 pm

      Gigabyte GA-G31M-ES2L
      Xeon X5460 (C0)

  • Jeff_HxC2001 July 17, 20162:21 am

    Gigabyte GA-G41M-Combo V2.0 (Bios version FB)
    Xeon E5450 (C0)

  • Pedro July 17, 201610:58 pm

    Thanks Mr.Experimentist .
    With your indication I did correctly.

    Note that rose video parameters and fell evaluating in a tenth from the previous Core 2 Duo E8400 processor,but I´m happy because I learned about that.

    I offer to donate the modified bios for AsusP5Q motherboard. Processor Xeón E5440 ( CPUID: 10676-STEPING: CO- sSPEC: SLANS )

  • Dimi July 18, 20165:51 am

    Verry nice Instruction.
    I added microcode for my X5460 in my Abit IP35P Motherboard. After that the temperature showed correct values (around 50C instead constant 98C on the old Bios).
    The Problem is that i can not boot in my windows anymore.
    Win 7 has a bluescreen (verry fast, can not see the message)
    Win 10 bluescreen with Errormessage (unsuported Processor).

    Please help.

  • koki1998 July 19, 20162:57 pm

    Guys I need your help :). I have a lenovo 9728-W1M mobo, whose chipset is Q45(eaglelake). Im currently running a Q8400 on it. I was thinking of upgrading to X5460 or E5450 but I found out that my chipset only supports 3xxx series.. Is it somehow possible to run one of those cpus on my mobo? Thanks!

  • bacon612 July 21, 201610:09 pm

    Just wanted to thank you guys for the guide!

    My Shuttle XPC SG41J1 Plus worked with a Xeon 5460 E0 SLBBA
    I had to update the bios microcode and it was easy with your instructions.

  • Freddy July 23, 201611:54 am

    Asus P5B Deluxe (with modified bios ver 1238).
    E5450 (E0).
    OC: 389×9=3500MHz

  • Mauser July 24, 20162:59 pm

    i’m asking if any one tried this mod with the MSI P45 diamond?


Leave a Comment

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.