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

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2,308 Comments

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.

2,308 Responses

  • ph4nt0m August 25, 20197:12 am

    ABIT AB9 QuadGT (P965 / ICH8R) with the latest v18 beta BIOS that supports E0 CPUs. Works great with L5408 E0 SLBBT 2.13GHz oc’ed to 3.2GHz at 1.12V (1600MHz FSB). 1333MHz FSB CPUs may need a BSEL mod to 1066MHz FSB in order to boot up. They can be clocked back in the BIOS.

    Reply
  • SAURHOS September 7, 201910:39 am

    HELLO , I’M TRYING TO RUN A XEON X5472 C0(SLASA) ,IN A GIGABYTE GA- EP45T-UD3LR REV. 1.1 AND OTHER ONE REV. 1.3, BUT NOT WORKING WELL.
    IN THE MOTHER REV 1.1 :NOT ACCEPTING MEMORIES IN DUAL CHANNEL, ONLY 2 MODULES OF 4G 1600MZ , IN SINGLE MODE , LIMITING HALF CAPACITY. SO I UPDATED THE BIOS TO VERSIONS: F8, F9, F10 AND F12 ​​VERSIONS, AFTER NO SUCCESS, THEN I MADE A MOD BIOS WITH F12 VERSION BY METHOD 1 REPLACING ALL MICROCODES 45nm AND 65nm, BUT I WAS NOT SUCCESSFUL, STILL NOT RUNNING WITH THE 4 MEMORIES MODULES.
    ON THE MOTHER REV 1.3 DID NOT UPDATE THE BIOS, AND IS WITH THE (F8) VERSION AND IT RUNS IN DUAL CHANNEL, WITH THE 4 MEMORIES MODULES AT 1600MHZ BUT, IT ONLY RECOGNIZES THEM AFTER BUZZER BEEP 20 TIMES OR MORE, EVEN REBOOTING IT A FEL TIMES.AT ONCE OF THIS REBOOTING ,I RECEIVE A MESSAGE :(POST error occurs ! )WITH A BACKGROUND COUNT, FOLLOWING TO( LAST KNOWN GOOD )IF I DON’T TOUCH ANYTHING.SO ONE TIME I GET INTO THE SETUP AND CONFIGURE THE CMOS , WITH SIMPLE THINGS, LIKE, UPDATE THE TIME AND DATE, DISABILITY THE FLOPPY , ORDER THE BOOT SEQUENCE, ……I THINK THIS WAS ALL, AND AFTER THIS ,IT NOT RUN IN DUAL CHANNEL ANYMORE , JUST WITH 2 MODULES IN SINGLE CHANNEL,THEN AFTER THIS I MADE A RESET ON CMOS, IN THE PINS AND AFTER 20 BUZZER BEEPS, THE MOTHER RECOGNIZED THE MEMORIES AND STARTED WITH THE 4 MODULES AGAIN.
    NOTE: AT THE TWO MOTHERBOARDS ,THERE IS NOT ANY MESSAGE IN THE POST SCREEN “ASKING TO UPDATE THE BIOS TO HAVE TOTAL PROCESSOR FUNCTIONALITY ” LIKE I SAW PEOPLE SAYING ON WEB.
    I SAW THIS MOTHER IS BETWEEN THE LIST THAT YOU TESTED, BUT THE XEON X5472 IS NOT BETWEEN THE PROCESSORS THAT YOU USE ON IT, SO MY QUESTION IS:
    HE WAS NOT TESTED ON IT MOTHER ?
    OR IT WAS TESTED AND DOES NOT WORK ?
    OR THERE IS ANY REASON WY IT WON’T WORK ?
    CAN YOU GIVE ME SOME SUPPORT ABOUT THIS?
    NOTE: I USED A CORE 2 QUAD Q9550 AND IT WORK NORMAL WITHOUT ANY ISSUE AND MY OS IS WINDOWS 7 64BITS.
    SINCE I’M VERY THANK YOU FOR YOUR HELP.

    Reply
  • not_bill September 14, 20192:41 pm

    fyi: L5420 workung fine with ASUS P5NT WS

    Reply

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.