LGA 771 to 775 Adapter (MOD) – Run faster Xeon CPUs in a Core 2 Quad motherboard



Detailed instructions for completing this MOD

Don't forget to fully reset your BIOS after completing this MOD - This is explained toward the end of these instructions, and it usually solves the majority of the problems that we hear about.

Disclaimer: We've done our best to explain this MOD in the safest way possible, and thousands of people have successfully completed it. However, please attempt this at your own risk. We are not responsible if your system is damaged during this process.

Things you'll need

Step 1 - Install the latest BIOS, and make sure your motherboard is compatible with your Xeon

BIOS updates often add support for new processors, so you have the best chance of this working with the latest bios for your motherboard.

If you haven't done this already, you should also verify that your motherboard is compatible with the Xeon processor you want to install. If it isn't, your system will likely fail to boot.

Step 2 - Remove the two plastic tabs from the LGA 775 socket, so you'll be able to install LGA 771 CPUs

This step was already explained earlier in this guide.

Step 3 - Attach the adapter to your Xeon processor (the triangle/arrow on the adapter should point toward the triangle on the CPU)

Static electricity warning: The circuits on the processor (above where the adapter goes) are sensitive to static electricity, so touch a screw on the back of your computer to discharge yourself before handling it. If you're using metal tweezers, it would also be a good idea to discharge them as well.

First, wash your hands, so you don't weaken the adhesive when you handle the adapter.

Make sure the top-right edge of your adapter is only 1 pad long

If you look at the adapter shown below, you'll notice the top-right edge of the adapter (with the letter T) is only 1 pad long horizontally and doesn't cover any of the pads to the right of it. This is how your adapter should look when you attach it to your Xeon processor (some adapters may have something else in the top-right corner instead of the letter T).

If the top-right edge of your adapter is longer than the width of 1 pad, you'll need to cut it to look like the picture below.

LGA 771 to 775 Adapter

LGA 771 to 775 Adapter

Remove the cover from the adhesive

The latest revision of this adapter comes with adhesive preapplied to the bottom of both ends of the adapter, which will help it stick to the processor. If yours does, peel off the protective cover to reveal the adhesive.

Safest way to remove the adhesive covers

The easiest way to safely remove the adhesive cover is to hold the adapter right below the cover that you want to remove. You then peel upward (toward the top of the adapter) like you're trying to peel off a sticker.

Just be careful to not damage the 2 metal pads in the center of the adapter or overly bend the adapter when removing the covers.

If your adapter isn't sticking securely enough, you can also use double-sided tape to secure it to the processor

The easiest way to do this is to attach the end of the adapter to a big piece of double-sided tape, and then cut around the adapter using the little scissors that some people use to cut their fingernails. Just make sure the tape only covers the ends of the adapter (so it doesn't cover any of the pads on the processor).

Line up the adapter on the bottom of the Xeon cpu

Carefully lay the adapter onto the processor and align it as shown in the previous picture. Tweezers are helpful here.

Make sure the triangle on the bottom of the adapter is pointing toward the triangle on the CPU (some adapters have an arrow in the bottom-right-hand corner instead of a triangle).

Important: Take your time and make sure the adapter is aligned exactly as shown in the picture (you may want to use a magnifying glass to verify). If it's off by much or covering some pads that it shouldn't, your system may fail to boot.

When you're confident the adapter is lined up correctly, press down on both ends to secure it to the processor.

Now double check that the adapter is still lined up correctly and is tightly connected to the processor. You don't want the adapter moving when you install it into the socket.

Step 4 - Correctly install the Xeon into the motherboard socket (the triangle on the CPU needs to be aligned with the triangle in the socket)

Make sure the triangle on the processor is lined up with the triangle in the socket as shown in the picture below.

Important: Ensure that the processor is fully seated in the socket before closing the lid (try wiggling the CPU a little). If the plastic tabs were not cut off fully, it may not make contact with all of the pins in the socket. This is a common installation error, and if this happens, your system will likely fail to boot.

Place the cpu in the socket

Place the cpu in the socket


Step 5 - Do a FULL BIOS reset (use the 3-pin motherboard reset jumper, and then load the default BIOS settings on the first startup)

Most motherboards have a 3-pin reset jumper that will allow you to fully reset your BIOS (this is usually mentioned in the manual). If yours doesn't, you can also remove the CMOS battery (it looks like a watch battery) to reset your BIOS.

When you start your system for the first time, make sure you also go into the BIOS and load the default settings.

If you would like more details on how to correctly do these steps, check out the following pages:

Note: Your system may cut itself on and off several times before booting up correctly the first time. This is normal with some systems, and it should start normally in the future.

Step 6 - Finishing up

If you run into any problems, please read the troubleshooting section of this guide. It covers most of the common things that can go wrong.

And if you still need an adapter or a Xeon processor, check out the following links:

Please let us know if this mod worked on a motherboard that isn't in our list

Leave a comment with your:

  • Motherboard model number (and revision if it has one)
  • Xeon model number (and stepping if you know it)
  • (Optional) chipset, max FSB, max TDP, and supported LGA 775 processors

And we'll add this information to the motherboard compatibility section, which will help other people that are also using your motherboard.

2,019 Responses

  • DaniV March 28, 201811:21 am

    Hello, I buyed intel xeon E5440 SLBBJ (E0) from aliexpress for my Pegatron IPMEL-AE motherboard with G41 chip but couldn’t make it work properly.
    First i tried to install it without microcode update since i have G41 chipset but it just got stucked on the initial BIOS screen and didn’t enter neither the BIOS or windows.
    Then i updated the microcode via afudos and (after removing the battery of the BIOS and reset it to default) was able to enter the BIOS, wich recognised the processor but once i tried to enter the system the loading screen was laggy and after a while (MUCH longer than it takes to boot the system) it showed me a blue screen with the error code “DPC WHATCHDOG VIOLATION” wich seems to be probably hardware incompatibility.
    I saw on some comments that some processors doesn’t work with E0 stepping but they do with C0. Does anyone with a similar motherboard know if it can be related to that or if there is any solution?
    I will be very thanfull with any help you can provide me :).

  • OliKa March 29, 20185:28 am


    I tried mods with three Motherboards lately using XEON E5450 SLBBM (Stepping A Revision E0).
    Hopefully I can help updating the motherboard list.
    On all the motherboards I used microcode upgdated bioses from http://genius239239.myweb.hinet.net/771/

    1. ASUS P5N7A-VM

    – “Intel C-State tech” MUST be disabled!!!
    – C1E can remain enabled!
    – stable for more than 24 hours

    When enabling C-state booting Win10 and Linux will be slowed down extremely (like 20 minutes or so to login)


    – works like a charme, all available C-state settings enabled
    – stable for more than 24 hours

    3. Gigabyte GA-E7AUM-DS2H

    – very unstable!
    – playing with c-state settings doesn’t improve stability
    – sudden hard restarts (without bluescreen) between running time of 15 min. to max. 3 hours
    – checked with 2 XEON CPUs – same result
    – works well with Core2Duo E8400, so the motherboard itself is most likely okay
    – failed with this XEON E5450 E0

  • GRX April 1, 20182:12 am

    Have had this working for a year no issues in my Gigabyte Motherboard (previously listed).
    However, someone trying this may want to be careful about temps. I installed this E5450 in my machine just using the original Core Duo heatsink fan and some new arctic silver.

    According to both the hardware temp monitors I have installed I’m idling at 58C on the cores and SURGING up to 95C at load. CPU reading is at 42C under load.

    If this core reading is accurate, I’m surprised the CPU hasn’t exploded. But, unless a replacement heatsink and fan is really Cheap, it isn’t worth it to invest anything else into an obsolete system (just the CPU swap is getting questionable at this point).

    Just thought I’d throw that out there. Apparently, you can’t take it for granted that you can run this Quad Core even at stock at a reasonable temp using Core Duo cooling.

    • GRX April 5, 20187:28 pm

      I think this is resolved. Some of the issue ended up being that the temps were reported somewhat inaccurately high. Although, even discounting that, the temps were still way too high.

      the main issue ended up being the Intel heatsink and fan. At least one of the plastic pins which is supposed to mount it to the board had broken off, allowing the heatsink to ride up on a corner.

      This Intel cooler is a real POS. I ended up removing the motherboard, ripped the pins out of the heatsink/fan and bolted it to the board using thin bolts, nuts and thick rubber gasket washers.

      After, temps at idle have dropped to around 40C and around 60C at max.

      That should do it- for non-overclock

  • ShohS April 1, 20185:19 am

    MSI g41m-sp20 works with E5450 (E0) (xeon microcode applied)
    MSI p31 neo v2 works with E5430 (C0) (xeon microcode applied)

  • Vince April 4, 20184:46 am

    Vostro 220 board with xeon microcode bios update doesn’t boot with an E5472

  • Rafael Costa Ferraz April 12, 20183:21 pm

    Hello friends, as I was recommended, I placed the intel xeon 5450 on my motherboard striker extreme chipset 680i, but when I updated the bios of her with the file 771 of this link that I was indicated (http://ideafix.name/stuff/Striker -Extreme.zip)
    My computer does not start ….
    (Note, it does not even start with my old processor)

    Please, friends, I need help …

  • Greensmack April 15, 20189:39 am


    I wanted to report that I have an Asus P5W DH Deluxe motherboard running on a Xeon 3370; clocked to 3ghz per core with an FSB set to 300mhz.

    Depending on the video card installed, and if PEG is enabled for the video card, the FSB can go as far as 315mhz before encountering BSODs in windows. (PEG is a PCIe bus performance booster that also can affect any PCIe peripheral cards, too; like SATA or NVMe adapters/controllers for PCIe slots).

    To get the 3370 to work properly, the same bios I had previously was simply reflashed back to the motherboard.

    I did not have to update the microcode of the bios rom itself, although I wouldn’t advise against it; I just wanted to report that the latest public release for the P5W DH Deluxe works with the Xeon 3370; bios messages about the microcode go away if the same bios is reflashed back into CMOS.

    (I just wish 64-bit PCI-X functionality could be introduced the same way!)

  • bart April 17, 20185:02 pm

    ASUS P5K-VM works generally with a X5470, but i get during booting the folowing error mesagge:

    ERROR! The CPU Core to Bus ratio or VID configuration has failed!

    will try a stronger Power supply tomorrow…

    • bart April 19, 20186:05 pm

      700W Powersupply did not help,
      System is running stable but i do not have the full perfomance (~3900 CPU Mark Score instead of ~4600)

      Microcode update has been processed, BIOS resetted… any hint ?

  • JJ April 21, 201811:53 am

    Just came here to say that the ASUS P5QL-EM works, seems by the model number it’s the same series as the P5QL-E plus the specs are similar, and the 5450 Xeon that I used is compatible with both motherboards

    Gave a 10 second countdown, flashing microcode update fixed it, the user interface of the bios modding program could be designed better tbh


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.