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

2,352 Responses

  • Rizqy_2009 January 8, 20196:53 am

    I have an Intel Xeon E5430 CPU that I installed on Gigabyte G41MT-S2PT Rev: 1.0 with bios version F2,
    my computer can run smoothly but doesn’t support Intel Virtual technology, even though I have activated it in my Bios settings. beg for solutions from all friends.

  • João Paulo Florea January 11, 20195:28 pm

    Ola, gostaria de saber o que preciso fazer para instalar um xeon e5440 em minha placa mae que é uma pegatron IPM41-D3 R1.00… Preciso mexer nos microcódigos e atualizar BIOS? Onde encontro os microcódigos para ele?

  • driver7 January 12, 20196:12 pm

    Dell Vostro 230 Socket LGA775 Motherboard 7N90W 07N90W

    Can I use the xeon x5450 x5460 processor as my motherboard model?

    I will translate your answers with a dictionary

    The Q9650 and Q9550 know that I can use these two models; but xeon is a cheaper cpu please write nice answers

  • driver7 January 12, 20196:18 pm

    !!!! Dell Vostro 230 Socket LGA775 Motherboard 7N90W 07N90W !!!!

    Can I use the xeon x5450 x5460 processor as my motherboard model?

    I will translate your answers with a dictionary

    The Q9650 and Q9550 know that I can use these two models; but xeon is a cheaper cpu

    please write nice answers !!!

  • Ralf January 13, 20192:57 pm

    Asus P5N-D + X5460 Works

    BIOS 1401

  • Hisham January 15, 20193:51 pm

    Asus P5q3 + x5460 works.

  • Andrew January 15, 201910:23 pm

    Trying to run an E5472 on a Dell Inspiron 530 with a G33M03 motherboard running 1.0.18. I can’t even get to the BIOS. I just get memory error beeps until I put my old Q8300 back in.

    • Petar January 20, 20198:49 am

      Try switching the place of the modules or try each one by itself

      • Andrew January 26, 20191:59 am

        The E5472 runs in a normal LGA771 board still but won’t post with the mod on my LGA775 G33M03 board. I put an E5450 in and it worked fine. I used multiple adapters on the E5472 to see if that was the issue.

        • Petar January 26, 20193:33 am

          Well it seems to me your mobo suppoets only 1333 MHz FSB CPUs and your CPU has 1600 MHz FSB

  • Annos January 16, 201911:17 am

    Hello. I succesfully installed a E5450 on my771 P35 ds3L motherboard.

    The “only” problem I have is that the cpu lowering the multiplier to 6 when on load…
    So I miss the full potential. When I go back to bios I have to reset it to 9. First it stays there in ratio.
    But when on load it is lowering the multiplier and so the fruquency to 2.0 Ghz per core. :(
    The ratio temperature is about 70-80…and when on load it goes to maybe 90. Is it too high and its regulating itself to a lower multiplier then?

    • Petar January 20, 20198:48 am

      Depending on your Bios settings, yes it is able to lower its clock due to temperature but you can turn that option off but that temperature is too high.

  • Miroslav Bazala January 16, 201911:25 am

    Hi, I would like to confirm that X5460 (E0) works flawlessly in Asus P5N-D. Works without updating microcodes (bios version .1207)

    • Petar January 20, 20198:46 am

      Only mobos I heard that work without the microcode are gigabyte mobos.

  • Annos January 16, 201912:21 pm

    To all that are interessted. I got to managed it. It really was the temperature. My cpu fan was loose.
    Also I cleansed the cooling fins, the fan and the case. And in addition I improved the Thermal compunds by removing a bit from cpu because it was too much maybe and it flushed a bit. And I made sure that the whole cpu was covered with it, with no holes. Now when I was trying to remove any possible mistake I have max 70° at load and average 45 maybe idle. Perfect now, it seems! Thanks for the community who gave the ideas.

    • Annos January 16, 201912:27 pm

      So the CPU is finally working who it should with full potential now! Iam impressed by the amount of improvement what we got for just ~15 euros! :) The next would be an old new good graphic card

      • Annos January 16, 201912:34 pm

        Update. Okay Full load: 80°. Hope its still Okay.

        • Petar January 20, 20198:45 am

          I think that 80 degrees Celsius is a bit too much, but depends on which xeon you used. If it is Xeon x5460 than it should not get over 63-65 degrees

          • Annos January 20, 20199:42 am

            Thank you very much Petar for your Reply. As I said, it is a x5450. Iam just trying with speedfan to increase the speed of the cpu fan a bit and observing what it does.

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.