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

2,308 Responses

  • William Pete December 21, 201812:47 pm

    The Dell Optiplex 380 information is incorrect.
    It supports up to 120W CPUs,and X5470 is confirmed by more than 1 user.
    My own specific computer.

  • Mauro December 23, 20188:06 am

    I have an Asus p5b with a p965 chipset. I would like to install a Xeno X5482 cpu. I contacted a cpu reseller on aliexpress and he informed me that this type of CPU and others are not compatible with my m / b model. It’s true? Looking at your tables I would say that my m / b is perfectly compatible with the cpu I want.

    • Denis January 3, 20194:02 am

      Hi Mauro,

      your motherboard doesn’t support the CPUs with 1600MHz FSB, you can use the ones with 1333MHz FSB (In theory the X5450 is the best CPU you can use on your motherboard, but I don’t think it will work with the P965 chipset).
      I would recommend to go with the model E5450, since that is probably the best solution for your motherboard. That CPU is tested and working for sure on your mobo.

      Best regards!

    • Denis January 3, 20194:04 am

      Typo error:

      In theory the X5470 is the best CPU you can use on your motherboard.

      • Mauro January 3, 20194:56 am

        Thanks Denis, I’ve just bought a x5460 whit Arctic freezer 13 for cooling. This weekend I will mount all and after leave my experience whit this cpu if work

  • RamonRodriguez December 26, 20188:25 pm

    I cant seem to extract microcode zip file on the command promt. please help.

  • Giulio Trupia December 27, 201810:11 am

    I have a xeon x5472. It worked without problem after modding bios with p5kpl-am epu.
    I also tried that processor with p5n73-am with modded bios but there is no way to boot it up, chipset’s heatsink is on fire and the sistem continue to freeze with over voltage error and over temperature error. The problem may be is the fsb of 1600mhz that is supported only on the first mobo. I also have photos to verify.

    • Petar January 20, 20198:54 am

      Well if the second one doesn’t support 1600MHz FSB of course its not gonna work, you can damage the motherboard like that

      • Giulio Trupia January 20, 20199:07 am

        I know that. I only say that to inform anyone interested in these mobos and also becouse they Say the p5n73-am supports all xeon but Is not true

        • Petar January 20, 201910:03 am

          I wanted to reply to his comment, not yours, sorry

  • Carlos December 28, 201812:28 pm

    I have teasted a Xeon X3220 on a ASUS P5 G41T M LX . It is working perfectly. ;)

  • Emrah Kurt December 31, 20181:00 pm

    i today buy a X5460 and installed. Work but fan works very fast only now 3000RPM. i need a bios:( please help me.

    Lenovo ThinkCentre A70
    Motherboard name: Lenovo L-IG41M2 V1.0
    Bios: 9CKT10AUS
    Bios: AMI
    SMBIOS Version: 2.6

    • Petar January 20, 20198:59 am

      Tried finding a modded bios online, but it seems that you are on your own.

  • Fang Furio January 4, 20193:15 pm

    Hey, so based on the info here I picked up an ASUS P5N-T Deluxe mobo to use with my x5470, but the board doesn’t seem to support these chips at all. I’d tried an x5470, x5460, x5472, and an e5450 but none of them have allowed the board to post. I tried with both the most recent bios, unmodded, and with the bios modded with all the microcodes added, but still nothing. I’m not sure if it’s just that the bios modding isn’t working or what, but the board will only post with it’s officially supported chips.

    And before anyone asks, I am using a v1.02G model of the board.

  • Ossamenta January 5, 20198:24 am

    E5450 (1067A) funciona perfecto en asrock g31m-s r2.0 con bios microcode

  • Dinnercore January 6, 20198:32 am

    I can report that my XFX 780i SLI works well with the X5482! The X5482 needs 1600 FSB, my board only officially supports 1333, but I could manually set FSB to 1600 and it works. Due to the locked multi and high FSB it does not OC well, but it works :)
    I did not have to modify bios for this, SSE 4.1 and VT-x are working.

  • Karen January 7, 20196:40 pm

    On the list no my Motherbord name ` Gigabyte g41- mt s2 , please say me can i normally use Xeon x5460 without update Bios ??


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.