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 eBay 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 $6 on eBay (usually much 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

2,484 Responses

  • mark November 25, 20205:02 am


    and good morning.

    Is it still possible to get a Bios patched ?

    I have several Boards and not shure if there is a bios patched.

    P5E-VM DO

    Thanks for any idea or reply

    best regards

  • Александр November 28, 20202:38 am

    здравствуйте помогите мне найти микрокоды под материнскую плату 775/Zotac/G41ITX для Х5470
    В биосе определяется отлично , систему пока не устанавливал т.к нет подходящего охлаждения на него 120 W . Заказл на 124W охлад жду

  • Ruparo November 28, 20202:01 pm

    Buenas, acabo meter los microcodes en una ASUS P5KC BIOS AMI v.1203 porque he comprado un XeON E5450. Funciona perfecto. Si alguien necesita la bios con el añadido para SEON E5450 3.00 GHz (SLBBM) se lo envio. Un saludo y muchas gracias por esta increible web.

  • Elcio Alexandre Budai December 16, 20201:34 pm

    Minha placa mãe é a P5G41T-M LX3 está com o xeon 5450 preciso o microcodigo poderia me ajudar… Obrigado !

  • nokiauser December 22, 20202:59 pm

    Hello, my motherboard is EP45-DS5 rev 1.0 with modified BIOS, my processor is Intel Xeon L5420 (SLBBR). My computer is working well. Thanks for the forum help!

    • Anonim December 30, 20202:42 am

      Hey, i wanna ask, how to mod gigabyte bios ?Because it is exe file, so i little bit confused. Thanks
      Sorry for my bad english

      • nokiauser December 30, 202012:26 pm

        Bios is not an exe file, download it from the official website, then you can modify it.

        • Anonim December 30, 202010:46 pm

          When i extract that file, there are f9,flashspi and bat file. So where is the .rom file?

          • nokiauser December 31, 20205:05 am

            *.f9 is the bios rom file.

  • James December 27, 20206:58 pm

    tengo una gigabyte GA-945GM-S2y un xeon E5450. alguien sabe donde encontrar la bios?

    • nokiauser December 30, 202012:38 pm

      i945 chipset may be non-modifiable for xeon processor.

  • Imre December 29, 20204:54 am

    üdv asus p5p43td pro-hoz lenne-e valakinek moddolt bios-a? xeon x5460 kellene hogy belemenjen,de sajnos nemnagyon találok hozzá biost. a processzor matricázva van.

  • Nguyễn Cường Thịnh January 5, 20214:21 pm

    Chào anh/chị, cpu xeon em mod không nhận VT-x.
    E5450 (1067A, E0)
    G41, 1333Mhz.
    Xin cảm ơn!

  • KARLOS January 6, 20213:14 pm


  • S3korn January 8, 20215:47 am

    X5460 works with
    GA-P35-DS4 Rev. 2.0



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.