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

2,352 Responses

  • Bore S October 15, 20192:03 am

    I have tested the ASUS P5K motherboard with the XEON X5460 ( Quad-core 3.16 Ghz 45nm ). It works perfectly. Without a MOD, the XEON is not reconized during boot but there is no trouble if you skip this message. With the MOD, the XEON is well recognized and the motherboard works perfectly ( Linux & Windows ). The last BIOS offered bt ASUS ( 1201 ) is patched and has been used in this motherboard.

  • sergey October 16, 201910:33 pm

    уменя материнская плата p35-s3g rev1.0 я прошил биос модифицированый под хеон 5450 с флэшки старый биос F5 работал с процесором Е8600 нормально когда поставил хеон 5450 и прошил биос мод 771 сфлэшки процесор не грузится экран черный кулер работает потом выключается вообшем биос не грузится помогите запустить хеон 5450 сергей иркутск

    • jose huayta November 24, 20198:47 am

      tengo una placa Koloe ZX-G31LM tendran un microdode

  • Citmeliksitir October 19, 20195:09 am

    I bought E5440 on aliexpress and replaced it with my old pentium e5200. It also has mod sticker already. I started the pc and it stuck on post.
    Normally it must detect ram and sata.
    My mobo is G31M-ES2L.
    I can’t find any help for it!
    How can I solve it?

    • Frank December 1, 20191:34 pm

      Citmeliksitir, did you install the latest motherboard BIOS before changing the CPU and installing the E5440 Xeon? If not put your original CPU (e5200) back in, boot the motherboard as you did before, download the latest BIOS from Gigabyte and install the BIOS. After installing the lastest BIOS then you can swithc out the CPU for the Xeon. I have the same motherboard running the Xeon E5450 at 3Gig.

    • Andrew T. December 20, 20192:44 am

      Did you patch you BIOS image prior to flash it?
      There are BIOSes that do not officially support Xeons, but thanks to MMtool you can patch them with correct microcode…
      Search for it, Google helps. 😉

  • Tu Dam October 22, 201912:17 pm

    I just got a modded Xeon 5450 and installed it on G31M-ES2C motherboard and running fine currently.

  • Марат October 23, 20192:23 pm

    Не могу запустить систему: MS-7392 V1.0, Xeon E5450.
    При запуске не загружается Windows 7, отключается клавиатура, не могу выйти в БИОС/

  • Batizap November 3, 20191:35 pm

    Chinese Colorful C.G41H D3 v23 (18,5$ Taobao)) works with X5460 (10,9$ Aliexpres), before first start open BIOS by pressing DEL and readjust power in Power options for higher power (enable for higher than 95Watts).

  • валентин November 4, 20193:50 am

    добрый день! мать asrock g31m-vs2 r.1.10 а у вас модифицированый биос ревизия 1.20 если перепрошить работать будет или нет? Хочу поставить e5430- eo.

  • Abhishek M.R. November 17, 20191:12 am

    Installed Xeon X5450 3.0Ghz 12MB cache in Mercury gG1 motherboard. processor detected and boots up windows but soon ran into blue scree of death showing memory error disable caching or shadowing. Plz help

  • joven domino November 20, 201911:24 am

    my intel xeon 5450 in my computer showing 2 cores not 4 cores? but i check into device manager its show 4 cores.. help me pls? my motherboard is ga g41mt d3v..

    • G31MPX December 1, 201911:24 am

      Мат плата G31mpx , процессор e5440 ревизия C0

  • dave November 25, 20199:02 pm

    Can confirm that on P5E-VM DO e5450 did NOT work, even with bios mod. x3363 works fine at FSB 1333. Once you install the chip, reset the bios (remove battery then set the jumber to reset). After the “F1 to enter bios” error message -> Insure that you set your ram speed in the bios to the speed of your installed ram (in my case 800 Mhz) otherwise your computer will fail to boot.


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.