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

2,386 Responses

  • Johnny_Jo November 6, 20185:55 am

    Gigabyte GA-P35-DS3P + Xeon E5450 = Worked perfect on 3.0 GHz.

    • adrian November 13, 20182:55 am

      hi i installed a E5450 into g41mp33 , i booted it and nothing appeared, not even the bios . does this mean i need to do the microde thing in my c2d before putting in the xeon?

      i have not reset the bios too.

      • PaulieLUL November 16, 20181:19 am

        Put the old cpu back, install newest bios with injected microcode and reset the bios to default by removing the cmos battery for a few seconds

  • piter November 6, 20188:10 am

    Hello I need your help . i have
    Intel® P43 chipset
    FSB 1600(O.C.) / 1333 / 1066 / 800 MHz

    CPU Intel Xeon Quad core X5482
    3.2GHz 12MB L2 Cache 1600MHz 45 nm

    I need to change something upgrade ? BIOS!! for running better

    • Thao Nguyen November 16, 20189:28 pm

      You need to upgrade your BIOS to fully support the X5482.
      Use MMTool to MOD your Bios using the LGA 771 Xeon Microcode,
      creating a new patched ROM and then updating your Bios.

  • mned November 7, 20183:49 am

    My own experience:
    Asus P5QL-E + X5482 3.2 GHz = Exelent work.
    Asus P5KPL + E5450 3.0 GHz = Trouble -> BIOS shoes 2 Cores; Over temperatute warnings … iven if i made correct BIOS mod.
    Any help?

  • не нашел November 8, 20184:47 am

    не нашел материнку 945pl-s3p

  • William Pete November 12, 20181:12 pm

    The Optiplex 380 has a 120W CPU limit and can run an X5470 confirmed.
    You used to have the correct info. listed for this system. There are several 120W Xeons running at userbenchmark.com
    X5460 and now my X5470. BIOS Mods.com has a patched Opti 380 BIOS for this.
    My system.
    All Optiplex 380 systems.
    I have also run a Q9505S in it so no issues with newer steppings even with BIOS A05

  • Mykolay November 13, 20188:45 am

    Asus Commando
    Asus P5KPL-AM SE
    Couldn’t load bootloader with E5310

    • mned November 16, 20184:43 am

      The motherboard must support your CPU. Put the old cpu back or any other native supported by motherboard CPU(i’m using an old Celeron), install newest BIOS with injected CORRECT microcode and reset the BIOS. Then install again new CPU.

      • PaulieLUL November 16, 20185:18 am

        Yes, W10 needs some intructions that the xeon has, but it needs the microcodes for it.

      • Mykolay November 17, 20183:50 pm

        “BIOS with injected CORRECT microcode”
        does not load the OS in SSD

        • mned November 18, 20182:32 am

          I see you added all steeping for your processor:
          6F7 (SL9XR, SLACB)
          6FB (QWVK, SLAEM)
          Try to save only that fits for yours: respective 6F7 or 6BF (identify it first).
          And what OS you want to start?
          I have troubels too with an Asus P5KPL-AM and E5450, C0. It shows incorrectly temperatures. But probably this is BIOS and chips limitatons.

        • mned November 18, 20182:41 am

          And did you removd any older bios microcodes for your processor?

  • Sastok November 27, 20183:53 am

    Asus P5Q (bios 2209) with Xeon 5472 (3.00 GHz) worked after microcode injection

  • gits November 28, 20187:54 am

    I have a problem for my PC,

    I’m want to upgrade processor x4560, but i have mobo G35 until processor core 2 duo e6400,
    who’s trial mobo G35 processor x4560 compitable ? or not ??
    and what for using compitable upgrade processor G35 to verygood ??
    thanks.. :)

  • ycdh November 29, 20182:40 pm

    Intel® P45/P43/ICH10R chipset
    used a intel xeon x5460 the first time it booted and worked but after 30 minutes the pc crashed and it was stuck in a BSOD loop i have updated the bios with the microcodes and it still didnt work, when i switched back to my old cpu that one worked. need help

  • Erbil November 30, 20184:44 am

    Hi there, how about e5450 with Asus P5NT WS ? I am going to upgrade my old q6600 to xeon… Any unstability ? May i OC it too ? Thanx


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.