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.

1,844 Responses

  • na7ane October 9, 20176:14 am

    hello there , I’m thinking about purchasing xeon x5450

    but I’m a little confused , it seems like it’s already modified to run on 775 socket so I don’t have to worry about adapters and such

    but I’m not sure if it’s really as good as q9650 or not , I tried to see if it’s as good or not but it seems like there are no deep comparison on the web

    p.s. I’m buying it for gaming , I’m not saying that I’ll never use it for other stuff , but I want to know what’s better for gaming and gives me better fps

    also I’m not going to oc it , probably .. as I have no experience in doing that + I’m not even sure if my mb can oc it or not

    • Alex2000 October 9, 201710:35 am

      What’s your motherboard? Xeon e5450 is better than x5450. e5450’s perfomace is equal to q9650. For better overclocking results you should buy e5450 with latest stepping E0 (SLBBM).
      Don’t forget to check compability with your motherboard.

      Also check xeon list here:

      • na7ane October 9, 20174:31 pm

        my motherboard is g41mt or something .. it’s not for gaming but that’s what I have .. and I’m almost sure I can’t overclock with this mb

        my budget is around 20 bucks , I’m planing to buy a used cpu .. anything above 20$ I can’t buy .. and as I can see this e5450 costs around 27.50$ so I don’t think I’ll be able to buy it

        so are you saying that the x5450 is bad , or won’t get me good framerates ?

        + is it better to just buy a c2q q6600 or q6700 .. than buying a x5450 ?

        and one final question. in my mb info in official Intel site they say that it works for nm45 .. so does that mean it won’t run a nm65 CPU ?

        • Stepa October 10, 201710:03 am

          What is your motherboard model? Intel G41 Chipset?
          Instead of the E5450, you can buy the E5440. The difference in performance is small, but the price is half as much. In any case, it will be better than the Q6600 / Q6700.

          • na7ane October 10, 20174:14 pm

            I really I’m new to this stuff .. I don’t know much about hardware and such .. so I’m not sure if this is what you’re asking for or not

            my motherboard model name is Intel g41mt-s2pt

            about chipsit .. i googled how to find it .. in device manager/system devices

            I found those 2 lines

            Intel chipset PCI express root port 2E31

            Intel chipset processor to I/o controller – 2E30

            does modified Xeon e5440/5450 work on my motherboard ?

            also I have another question .. what is SLBBM .. and .. SLANQ .. what should I buy ?

        • Stepa October 11, 20171:41 am

          So you have the motherboard Gigabyte GA-G41MT-S2PT? The Xeon e5440/e5450 should work on this motherboard.

          SLANQ/SLANS – C0 Stepping
          SLBBM/SLBBJ – E0 Stepping (newer, it is considered that the revision E0 is better for overclocking)

          • na7ane October 11, 20174:54 am

            yes it’s that model .. thank for the info

            so do I consider that it’s possible to over clock the CPU with this mb , or is it a bad idea ?

  • Alex2000 October 9, 201710:22 am

    I got some issues with my eg43m motherboard (acer aspire m3800/m3802). I know I need to disable c1e. But the option is missing in bios. Trying to find how to add that option.

    Some problems are:
    Installing/loading windows takes forever. It took me about 30 hours to install windows 10.
    Stuttering in games.

    To make windows work good again I need to open registry and change intelppm’s START value to 4 (it’s located in HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\Services\Intelppm) then reboot.

    Does anyone know how to disable c1e in my bios?

    • Stepa October 16, 20179:11 am

      Have you flashed a modified bios?

  • Zé Bandido October 10, 201710:36 pm

    Ive added the xeon microcodes on Gigabyte G41M Combo 1.4.
    I used the Q6600 on 500W PSU.
    Then I installed the Xeon x5470 and first crashed on Windows 10 boot.
    Then after several tryouts, the mobo started to write the BIOS before booting to Windows.
    After the writing I access the BIOS and got a message on MIT saying “…overclocked reversed…”.

    Then I resetted the BIOS through CMOS battery and turn off the PC for several hours.

    After that Ive turn on with a Windows 10 bootable pen and it started installing a new Windows 10.
    It worked until it asked me to reboot the PC, which i did. After that it started to behave as told early.

    Can it be the PSU fault? The Xeon is recognized on post.

    Ps: on PC Health tab i get 76 degrees celcius.

    Is this a faulty microcode issue or else?

    Thank you

    • Zé Bandido October 18, 201712:24 pm

      Just to tell that my issue was related to my PSU.
      Bought a 700W PSU and watercooling and works fine!

  • Giorgi October 11, 20174:37 pm

    HI, I have problem with ASUS P5G41T-M LX3 , I have updated bios 503 with microcode edited and it worked with x5460, but I have update to e5450 and when bios posted it shows “” to unleash this cpus full power update bios” I have already update what should I do, please help me out guys :(

    • Stepa October 16, 20179:02 am

      Most likely in your BIOS there is a microcode for only one revision of processors (stepping E0).
      To fix the problem, just add the missing microcode.

  • benjamin sheriff October 12, 20179:18 am

    E5450 “CO” stepping is working on the MSI PLATINUM COMBO which ant listed on the compatibility section , please add it to the page list!

  • Ccvvzzfg October 13, 20179:58 am

    Ga-ep45-ds3lr xeon e5450 C0 worked.


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.