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 $17 (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

1,468 Responses

  • wannabetechnician December 2, 20166:55 pm

    Got a

    XEON E5450
    sSpec: SLANQ
    CPUID: 10676
    Stepping: C0

    to work on an

    MSI P45T-C51 motherboard.

    Had slight booting problems before updating microcode that would solve through BIOS reset via jumper.

    P.S.: Thanks a lot for this useful website and all the amazing detailed guides!!

  • WM Verbruggen December 4, 20168:02 am

    Got a Xeon X5460 E0 (1067A) working on a Gigabyte P35-DS3R rev. 2.1 motherboard. Works with the newest bios (F13), but microcode update was needed for speedstep and some of the instruction sets.

  • 666 December 4, 20164:24 pm

    Hi i’m trying to make a X5460 SLBBA work on a XFX nForce 680i SLI.
    bios recognized the cpu and identify it correctly
    So I went and tried to install Win7, but I get a 0X0000007E error before I get to the installation screen. So I did the bios microcode update with a complete bios reset but the result is still the same… any ideas?

  • exonom December 5, 20161:30 pm

    I need some help! –> Q35 .–>X3363–> 771 MOD I have a HP Copaq convertible Minitower (dc7800). The plan is to upgrade the CPU from the e4600 which is build in right now to a Xeon X3363. I bought alreday the processor, but somehow I´m not able to bring it to life. The Motherboard of the HP PC is using the Q35 Chipset… and the Bios Version I use is v01.35. I think there might be a problem with the Bios because the chipset would normally support this xeon CPU Please…

  • kga1 December 6, 20162:45 pm

    Inetl Xeon E5472
    Asus P5Q Pro

    Update Bios, start is OK, no problems, is stable, test OCCTPT without problems, Kingston DDR2 1066Mhz 8 Gbt

  • stef December 7, 20161:49 am

    Hey i have a
    ASUS Digital Home Series P5W DH Deluxe

    – Intel® Quad-core CPU Ready
    – LGA775 socket for Intel Core2 Duo, Core2 Extreme
    – Intel 975X +Intel ICH7R 1066/800MHz
    – Dual-channel DDR2 800/667/ 533 max 8GB
    – 2 x PCI-E x 16 / 2 x PCI-E x 1/ 3 x PCI
    – Support ATI CrossFire graphics cards
    – Intel Matrix Storage technology
    – Dual Gigabit LAN
    – Dolby Master Studio technology
    – ASUS EZ-Backup
    – ASUS Digital Home features

    it runs a intel core 2 duo E6550 2.33 ghz 4m 1333Mhz
    can i do the 771 mod for a E5450
    my chip set intel 975X is not on Chipset compatibility table

    can you help me ?

  • Arpan December 8, 20161:42 pm

    Since x5460 and x5470 are same will x5470 work with asus pg41t-m lx3?
    Is the difference between x5460 and X5470 is just ghz? Or x5470 packs more power?


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.