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 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 $25 (about $70 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


Leave a reply
  1. Saif

    Confirmed working on a manufacturer machine the gateway lx6810-01. It does have a foxconn board which is custom but the bios is locked by gateway but its ok all you have to do is use the bios update but using the ami update tool because it is a american megatrends inc which is ami all you do is update the current bios update with the 3 microcodes for the lga 771 chip in my case it was the e5450 3.00ghz works like a charm just wanted to let people know who ever has this model of gateway it is possible i think i am the first one that tried this and i was succesfull only because the board supports any 45nm chip and the same board is listed on this page the Foxconn mcp7am01p8-1.0-8eksh almost the same instead of the p there is a G but its from the same board so dont worry it will work 100 percent for e5450 also any 45nm chips thank you guys and enjoy.

  2. Philip

    I can confirm that the X5482 with C0 stepping works with a Gigabyte GA-EG41MF-US2H motherboard.

    A BIOS update is required since the board is incredibly unstable without it. It won’t even POST with either an x5460 or the x5482 installed. I had to buy a Q6600 (again), install that, boot up, flash the BIOS and swap the processors again. When I did the mod with a P5B-DE, it was much more stable. It would boot up, but not load an OS. Like I say, an EG41 will not even POST and looked dead.

    I would like to say that the EG41 is an incredibly rubbish motherboard. Although it claims to support 8Gb of RAM, the RAM modules must be single sided. Have you heard of single sided 2GB modules??? I could only put half of my RAM in the machine, so I now have two RAM chips knocking around.

    I’ll check the x5460 in it sometime and see if that works too.

    • Philip

      Scratch that, I just noticed that the computer has limited the clock speed to 2GHz instead of the 3.2GHz I should be getting with an x5482.

      I’ll have to find out what’s going on.

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