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

  • Rodrigo January 17, 20192:53 pm

    Comprei um x5460 para a minha placa g41-vs3 será que vai funcionar???
    Deixei com um tecnico de confiança…
    Alguém sabe me dizer como posso atualizar a bios para esse mod?
    G41-VS3 + X5460

  • Rodrigo January 17, 20192:53 pm

    I bought an x5460 for my g41-vs3 card will it work ???
    Leave a reliable technician …
    Does anyone know how I can update a bios for this mod?
    G41-VS3 + X5460

  • ave January 18, 20199:51 am


    I bought an X5460 for my Asus P5K-E Wifi AP motherboard.
    Updated the BIOS w/ patched microcodes, and the updated BIOS worked with my original Core 2 Duo E6600 CPU.
    But after I changed the CPU, this error screen was displayed:
    Bad BIOS Checksum… (see screenshot)

    Putting back the E6600, all is well, the computer works perfectly.

    I tried two different modded BIOS updates, same results. I even tried to erase CMOS with battery out, jumper, waited quite a bit, reverse.

    Can it be a faulty CPU? Would be strange, as it works well enough to run this BIOS recovery tool.

    Maybe just the pin swap has bad connection? What happens if the pin swap is not done correctly?

    • Petar January 20, 20196:35 am

      I don’t know if ASUS has a Bios flashing utility, like Gigabyte has Q-flash, but you could try flashing the bios if you haven’t already.

      • Petar January 20, 20196:36 am


          • Petar January 20, 20196:39 am

            Sorry i didnt see that u already did it XD. But IDK my gigabyte mobo worked even without microcode update, but cpuz didnt recognize that the cpu had sse4.1,vtx,mmx and all.

      • ave January 20, 20196:49 am

        I tried at last 5 different BIOS ROM versions. Same results. :(
        I suspect the CPU is at fault, I’ll try to source another.

  • Petar January 20, 20196:32 am

    I modded a Xeon X5460(E0) to GA-P31-ES3G but I couldn’t mod the bios myself so I had a hard time finding it online. Also tthe only one i found was F7A beta bios. If anyone can mod the F6 bios for me it would be cool, but i can only qflash it bcus bios software updater thingy works only on 32-bit Windows. Bought a AVC 5$ cooler and my temps are: 35 idle, 56 under load. I also got the ASUS GTX 750 TI dual fan 2GB, but im planing to upgrade the mobo, it only supports 4GB ram

  • Hugo Steiner January 22, 20196:08 am

    I’m running an E5472 on P5P41TD but it seems that the microcodes I tried to instal haven’t worked because I can’t run it on stock clocks it for some reason runs 2.5Ghz instead of 3.0Ghz and I can overclock it only up to 2.93Ghz.
    But I’ll keep on trying and will report later!

  • Erick January 24, 201912:10 am

    Hi, I bought a Xeon X5460 3.16GHz for an Asrock G31M-S but for it to work I have to do underclock up to 2.8 and sometimes up to 2.6 GHz to make it stable, if I put it to its normal frequency and multiplier (333×9.5) the system will Freeze or a BSOD appears. I need help .Thanks in advance

    • Annos January 24, 201910:23 am

      Hello Erick. Iam not a specialist to be honest. But I will try to help anyway.

      First of all, the motherboard should be compatible to the xeon. When you set to normal frequency, when exactly comes the Freeze or BSOD?

      Try the following things:

      -Watch the temperature of the cpu. It should not come above maybe 63.
      -Bios reset (to make sure, that options that could make the system unstable will be set to normal)

      I have done exact the same things and yet my system is runnning stable now without bluescreen or suddenly restarts.

      Hope it could help you.

      • Erick January 24, 20197:15 pm

        Hello Annos, thank you very much for answering, I checked the temperatures and reached up to 78 ° I changed the heatsink and it went down to 60 ° reestablished the BIOS and the aforementioned happened, the system froze, so I had to do underclock, I left the multiplier to 8 and the frequency to 380, I did a stress test on AIDA64 for an hour and a half and it did not cause me errors, the adjustment to 380×8 has worked quite well.

        I would like to know the data of your components to compare them with mine, which are:
        Processor: Intel Xeon 3.16GHz (With Underclock 3.04)
        RAM: 2x2GB Kllisre DDR2 400MHz PC2-6400
        Motherboard: Asrock G31M-S (R1.10)
        Heatsink: Enermax ETS-N30-TAA (Previously had Intel stock)
        Video card: Nvidia GeForce GTX 750 Ti
        Power source: Xtech JSP-600P08N 600W

        Thanks in advance

        • Annos January 25, 20194:31 am

          Hi Erick,

          my Pc components are the following:

          CPU: Intel Xeon E5450 (3.0 Ghz)
          Motherboard: Gigabyte G35-DS3L (1.0)
          RAM: 2x 2GB Kingston 6400 + 2x1GB GEIL 6400
          GPU: Geforce 9800 GT
          Power Source: 450w

          Did you do a BIOS update?

          • Erick February 1, 201912:18 pm

            Yes, I have the latest version of the BIOS for my board, the 2.10, even with the microcodes for Xeon

    • Casey February 1, 20193:00 am

      do you have 2 ram modules with different sizes? or different manufacturer? or different chips?

      • Erick February 1, 201912:16 pm

        No, I have exactly the same modules, same brand, same frequency, and capacity

  • Do January 26, 20197:09 am

    I’m looking for a ready BIOS under xeon (xeon E5472)
    The EP45T-UD3LR Rev 1.0 motherboard

    • LiveDead January 31, 20191:05 am

      if not run, start with 1 module of ram

      • Domin February 12, 20197:21 pm

        how to run it/???
        step by step

        • LiveDead February 12, 201910:31 pm

          write the file from the 771 folder to the USB flash drive, go to BIOS, press f8, select our file – profit

          • Domin February 19, 20192:45 pm

            After loading the bios of the 45TUD3LR.F8 file the CPU is not working, I recall it is the REV 1.0
            What to do?

        • LiveDead February 19, 20194:38 pm

          if the processor is working and correctly installed, then I don’t know any more reasons, because e5472 and x5482 were launched on this board

          • Domin February 19, 20195:09 pm

            the processor in the 771 folder is not working, there are 2 bios files
            which one to choose? does not work xeon E5472
            remind you that this is the REV1.0 disc

        • LiveDead February 19, 20195:21 pm

          try both, any bios will do, revision does not play a role – bios for different revisions are the same

  • JLo January 28, 20194:47 am


    ASUS P5B (P965)
    X5450 (C0)
    ~3,4GHz (rock solid)

    becomes unstable above 3.5GHz, I assume due to Mainboard limitations


  • Aleks January 30, 20192:14 pm

    подскажите где мне взять модбиос MSI G41M-S0

    • LiveDead January 31, 201912:51 am

      если от G41M-P28 не подходит, и рисковать не хочется, то биос можно модифицировать, это займет минут 15 если всё читать, ничего сложного

  • Name February 1, 201911:54 am

    I also have an issue. I tried to install E5440 on P5KPL-E. I downloaded the newest BIOS, used MMTool to apply Xeon (067A) microcodes, then I flashed the BIOS using built in EZ flash 2 tool. After that I swapped the CPU. At first BIOS was showing old CPU clock (2,66GHz instead of 2,83GHz) but resetting it to the default settings solved that problem. I also disabled the power saving feature, just in case.
    Windows started normally but it was unusable. Basically a slideshow. CPU usage on all 4 cores was about 50%, task manager.exe was warkibg all the time, most processed weren’t assigned to users.
    As it started nicely, shutting it down took forever, now it fails to load – startup/Windows animation is laggy and after that screen goes blank.

    Definitely something is wrong. Any ideas?

    • Name February 1, 20194:26 pm

      I found a solution – I disabled Intel® C-STATE in the BIOS. Everything loaded fine. Almost.

      BIOS still reads wrong CPU temps (as if Tmax was 100C) and there’s no way to change it. It also means that CPU fan always operates at high rpm and it’s very loud. and annoying. I’m very disappointed with the mod, I think I’ll buy Q9400 instead of E5440, there should be no compatibility issues.


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.