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

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2,088 Comments

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 $1 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

2,088 Responses

  • ATARI July 21, 20187:07 pm

    successfully mod with xeon X5450 with ASUS P5K Deluxe/Wi-fi AP ( bios microcode applied )

    Reply
  • Sach A July 24, 20183:27 am

    Hello I have a intel dg965lv mother board and would like to know whether I can upgrade from a core duo e6300 to xeon e5450. It is a gateway pc and its an intel mother board so i do not really know what should I do about the bios. Help is appreciated!

    Reply
  • Math July 24, 20188:12 pm

    Hello, I have P5K/EPU P35 Chipset motherboard, is it possible to run x5460 cpu on it? Thank you.

    Reply
    • Math July 26, 20187:58 pm

      Can anyone make me a bios, I already have this board and cpu but i had problems with flashing and my bios cant boot anymore so im waiting for usb bios programmer now hoping to reslove my problem.

      Reply
  • dientm July 25, 201812:50 am

    Dear all,
    I’ve Gigabyte EP45-DS3LR with Xeon E5462.
    I updated newest Bios (added microcode) but cant boot.
    It’s working well with E8500 2x2Gb Ram + windows 7 Ultimate x64.
    Any suggest in this prolem?
    Thanks for help me.

    Reply
    • Big Smoke July 25, 201810:12 am

      Did you correctly attach the Mod Sticker?

      Reply
      • dientm July 25, 20188:17 pm

        Yes. The mod sticker was correct onto it and attached it to GA g31 it work normally.

        Reply
    • Eric July 25, 201812:20 pm

      That board is fairly similar to the EP43-UD3L that I tried yesterday. I don’t know if this matches your problem, but the initial boot cycled 3-5 times before allowing me into BIOS– I almost thought it wasn’t working until it finally settled down. I didn’t think to load setup defaults before switching CPUs. I expect some residual overclock settings lead to the cycle of resets.

      Reply
      • dientm July 25, 20188:22 pm

        Thats can’t boot. The phase led in Mobo was light and of several times, I wait it about 15min but can’t boot.
        I just update micro code but it still have a signal like a beer or etc…

        Reply
  • Eric July 25, 201812:02 pm

    I have two reports of success

    1) GA-965P-DS3 R3.3 works with E5450 (E0) [this mobo already listed as working with E5450]

    2) GA-EP43-UD3L R1.1 works with E5450 (E0) [this mobo predicts success with all]

    Reply
  • Pallab Kumar Das July 29, 201810:14 am

    I have Intel DG41WV motherboard and I am willing to buy Xeon X5460 ( already modded for LGA 775 ) from Aliexpress. Will it work perfectly? Please help me.

    Reply
  • Mike July 30, 20186:59 pm

    I have successfully installed X5460 into both Dell Vostro 220 and 420 mobos

    Reply
  • Bernd P August 3, 201812:09 pm

    Just bought some Adapter stickers via ebay for my emachines EL1580 (oem brand = acer).
    Put an Intel Xeon X5450 onto its socket and voila this works well. Windows reports 4 Cores, 3,00 GHz . One thing is: The Fan runs at quite high speed because it gets a bit hotter. (90W w Standard CPU, 120W with an adapted xeon 1333/12M/3GHz on the socket). Maybe it would need a better cooler.

    Reply
    • Bernd P August 5, 20187:43 am

      Addition to my above comment:
      It IS necessary in the most cases to apply Microcode patches for the respective Xeon CPUs into the BIOS file of the LGA 775 Motherboard (using MMtool), otherwise the CPU won’t run with Windows 8.1 or 10 (Windows 7 already runs without having the microcodes patched but the fan runs at fullspeed all the time e.g.).
      So, again the eMachines EL1850 now runs perfectly with it on 3 GHz.
      (and it also would be capable to use the 3.15 and 3.33 GHz CPUs with 1333 MHz FSB as well).

      Reply
  • tritelcul156 August 5, 20183:32 am

    E5450 and E5430 working on GA-EP31-DS3L.
    *note, this board accepts maximum 4GB of ram, despite having 4 ram slots.

    Reply
  • tritelcul156 August 5, 20183:39 am

    E5430 working on ASUS P5K-V. Bios is version 1002.

    E5450 not working on the same board.

    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.