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

2,406 Responses

  • REPITLEXDD December 9, 20197:04 pm

    Dude, I bought The Kazuk LGA 775 motherboard, g41-B chipset, on my Xeon e5450 requirements is 99% likely to work, but does it really work?

    • Andrew T. December 20, 20192:35 am

      …And moreover, there will be any life after death?
      We are ready to reply to every question we can’t reply.

  • Thorsten Giessegi December 17, 20193:53 am

    XEON 5440 tested with a Lenovo G31T-LM (rev. 1.0)

    Works! Plug and Play, nothing has to be done.

    Put it on the list ;)

  • Hugo Steiner December 20, 20195:05 pm

    I’m currently running ASUS P5P41TD with E5472 running down clocked on 2500Mhz due to FSB being limited to 1333 but it used to work on 2800Mhz + but it couldn’t hold up I guess. I’m sure any 1333FSB Xeon would run just fine. Also, I have not modified any BIOSes so that could be a part of my problem too. Also for maximum ram on this board, you need to use one-sided memory.
    I hope this helps someone.

  • bigodewalrus December 20, 20199:13 pm

    q35mdo ms-7358 supports xeon e5450?

  • Andrew December 21, 20197:24 pm

    Acer eMachines EL1850
    Motherboard Acer G41T-AD 1.0
    BIOS p01-b3.rom modded with all Xeons 45nm microcodes (no problem about space, i could share the file if you want)
    XEON E5450

    Runs smooth!

    Features that are not present into Xeon had been disabled in advance into BIOS, i do not know if this cares.

    • calavero December 27, 20196:00 am

      hi , i have EL1850 with Motherboard Acer G41T-AD 1.0 , can you share the BIOS p01-b3.rom modded ?

  • victhor75 December 27, 201912:25 am

    confirm working xeon x3363 on modded bios P01.B4, Acer G43D01G1 motherboard

  • snow December 29, 20195:46 am

    It works ! :-)
    ASUS P5QL Pro Rev 1.xx BIOS Version 1004 (MOD notwendig,sonst Fehlermeldung!)
    Intel XEON E5450 Family 6 Model 17 Step 6
    Chipset Intel P43 / ICH10 FSB 1333Mhz
    Intel Socket 775 Intel® Core™2 Extreme/Core™2 Quad/Core™2 Duo/Pentium® dual-core/Celeron® dual-core/Celeron® Processors
    Compatible with Intel® 05B/05A/06 processors
    Supports Intel® 45nm Multi-Core CPU

  • mikholae January 6, 202012:19 am

    i have msi g41m p28 and it is same specs as the g41m p33 combo that can run xeon x5460 but mine the fan spinning the power is on but no display. i already mod the microcodes intel xeon x5460 slanp. My board is compatible for xeon but it doesn’t work as i expected. please reply to my problem damnnn

  • Panos January 8, 202011:47 am

    Confirm working Xeon E5450 on Asus P5N7A-VM with latest moded bios as per instructions, using a mod sticker on the CPU and cutting the plastic edges of the motherboard socket. Thank you!

  • Llywelyn January 20, 20203:58 pm

    Got it working with the sticker mod in an Intel dg31gl motherboard
    CPU is a xeon e5450
    runs at a nice cool temp of 37c to 70c at max under full load.
    I like the cinebench score, major improvement compared to E2220 dual core :)

    only drawback is you have to solder your own x16 pci-e slot for gpu :(


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.