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 $17 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

2,203 Responses

  • blAck January 11, 20186:56 pm

    Intel DP35DP
    Xeon 5xxx – no way, not even try to start with 771 CPUs.
    Added all needed ucodes with HW programmer but it not help.
    Tried to run with negative result: X5450 [SLBBE], E5450 [SLANQ]

  • Андрей Андросов January 13, 201811:11 am

    MSI P45-C51 есть ли поддержка платы процессоров XEON?

  • sinair January 13, 20181:49 pm

    A placa-mãe do pc é sti semp toshiba sti 007030 chipset g41 fsd 1066 cpu fsd1333, comprei uma cpu xeon x5460 , 3.16 mhz 12 de cache fsd1333 tecnology 45 nm , max 95 w e quando ligo não inicia , o windows, pc desliga, a minha fonte e 450 watts. segundo tecnico, , xeon é para servidor , acredito que seja compativel o processador vem com adaptador tranfere lga 771 para 775 embutido, o que fazer ?

  • Darkzy January 14, 20186:09 pm

    Just completed on a Asus P5KPL-AM IN/GB/SI – used 0506 version bios with Microcodes embedded in, using MMTool (AMI Bios)

    X5460 currently installed Win 8.1

    Something to note, even with V-0506 BIOS would not boot Win 8.1 installer and would not allow Windows 7 install either until Microcodes were applied to Bios manually.

  • Velin January 18, 20183:10 pm

    Just tested Asus P5KC with X5472, SLBBB, E0. Updated microcodes with MMtool. Win 7 32bit. It works. Just need to do something about cooling, because 79 degrees at load are quite hot for a box cooler (it can’t dissipate the heat).

  • Sujan Kumar Lo January 20, 20181:30 am

    I have a g41 motherboard running core2duo processor. I have bought a Xeon x5460 processor that has modified to fit into lga 775 But please tell. Me steps to update bios. I am running windows10 pro 64 bit with ddr3 ram

  • Filip January 20, 20189:45 am

    Will the x5460 work woth the Gigante Ga p35c ds3r?

  • Filip January 20, 20189:45 am

    Will the x5460 work with the Gigabyte Ga P35C DS3R rev 1.1

    • Simon February 9, 201811:34 am

      Yes, literally just done it today. Working 100% so far. Just make sure you are on the F12 bios.

  • Mateoo January 20, 20187:00 pm

    xeon e5405 works fine on motherboard gigabyte ga-p35-ds3r

  • dd January 21, 20184:50 pm

    pleas give me a g41d3 version 6.2 to xeon e5430


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.