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

MODs

2,128 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 $14 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

2,128 Responses

  • Sean December 4, 20178:53 pm

    Abit IP35 Pro works with an x5460 perfectly. The only bios that seems to work properly though is v16, after the simple microcode update it runs flawless. I tried all other bios from 14-beta20 and none of them worked properly other then 16. With v16 I don’t need to change any voltages other then ddr to get it from 3.16ghz all the way to 3.8ghz which is a huge step up from the q6600! Thanks for the great tutorial!

    Reply
  • hyan December 6, 20179:13 pm

    i have refurbished asus p5ql pro motherboard,400w psu(local brand),,my bios is 1004 year 2009, 1×1 667/800 ram 2gb ram totaly,gt730 nvidea graphics card..,i don overclock anything..i am afraid to do,i just hav only intel stock cooler .so..i want to try x5482 cpu .please guide me,thank u

    Reply
  • hyan December 14, 20176:47 pm

    pls anyone reply

    Reply
    • Dave December 21, 201711:12 pm

      From what I can tell it will handle it. The Lithography is the same for the CPU & Motherboard & both the CPU & Motherboard are 1666 Bus. But make sure your Motherboard is new enough to handle the 1666Bus speed, if it is an older one than the fastest Bus on it would be 1333 & if it is the best Xeon CPU it could take would be the X5470 . Check your Bios for speed options to see if it can handle 1666 or check your model # & look online to be sure. It would not hurt to get a Bios update for it before trying the new CPU. The only thing I would reccomend is at least getting a better CPU Cooler & some Premium Gold Thermal Paste. You can get a high quality 775 CPU Cooler for between 20-30$ U.S. .

      Reply
  • Marvin December 16, 201710:20 pm

    Just ordered a e5430 from aliexpress to try out on Intel DG41TY. Wish me luck :D

    Reply
  • na7ane December 22, 20177:38 pm

    I’ll say this again .. I tried to over clock my Xeon e5420 on my g41mt-s2pt motherboard .. but it didn’t work out

    anyone can help me with how to over clock this CPU on this mobo ?

    Reply
    • Anonymous December 25, 201712:04 pm

      G41 chipset has low FSB limit, near 340-345 MHz (x4), so it is not possible to overclock the Xeon e5420. CPU with lover FSB could be overclocked, but for this CPU, with 1333 FSB, it is not possible.

      Reply
  • cem yay December 24, 20174:51 am

    Hello guys.
    I have LENOVO M58 desktop.
    It has Intel Q45 chipset mainboard.
    I want to try Xeon x3323 cpu.
    Should i add LGA 771 Xeon microcode to my BIOS ???
    Pls Reply

    Reply
  • Nabeel Khan December 28, 20179:57 pm

    Installed a Xeon X5450 premodded into a Acer MCP73T-AD motherboard that comes with the acer aspire x1800/x1700. Worked perfectly except for the fact that acer’s motherboard bios restricts the wattage to a value of 95W so it required some minor modification.

    To circumvent this, either install a cpu with a wattage that is within these guidlines (less than or equal to 95W ), or, when replacing the microcodes of the bios, use the ECS GF7100PVT-M bios as a base instead. This bios unlocks acers restrictions and, as an added perk, also allows for overclocking of the cpu as well as other componenets. It’s the motherboard that our MCP73T-AD is based on and works perfectly.
    Should support 65 and 45 nm theoretically

    Obviously flashing this other bios should be done at your own risk.

    Here’s a link to the bios i downloaded. The date of the bios uses standard chinese date format so the bios closer to the top is actually the newest one. Here: http://www.ecs.com.tw/ECSWebSite/Downloads/Downloads_Driver_Detail.aspx?detailid=839&MenuID=0&LanID=9

    Reply
    • Nabeel Khan December 28, 20179:59 pm

      Installed a Xeon X5450 premodded into a Acer MCP73T-AD motherboard that comes with the acer aspire x1800/x1700. Worked perfectly except for the fact that acer’s motherboard bios restricts the wattage to a value of 95W so it required some minor modification.

      To circumvent this, either install a cpu with a wattage that is within these guidlines (less than or equal to 95W ), or, when replacing the microcodes of the bios, use the ECS GF7100PVT-M bios as a base instead. This bios unlocks acers restrictions and, as an added perk, also allows for overclocking of the cpu as well as other componenets. It’s the motherboard that our MCP73T-AD is based on and works perfectly.
      Should support 65 and 45 nm theoretically

      Obviously flashing this other bios should be done at your own risk.

      Here’s a link to the bios i downloaded. The date of the bios uses standard chinese date format so the bios closer to the top is actually the newest one. Here: http://www.ecs.com.tw/ECSWebSite/Downloads/Downloads_Driver_Detail.aspx?detailid=839&MenuID=0&LanID=9

      EDIT: Reply if you want me to post a pre modded version of bios. Not sure if thats allowed on this site tho

      Reply
      • Nabkhan December 28, 201710:18 pm

        Forgot to add. Max fsb is 1333. Also EC’s bios may give a error about PCI on boot. Ignore it as the ECs motherboard has an extra PCI slot and the bios can’t find it. It should work fine despite the error

        Reply
  • Frankie b January 3, 20183:23 pm

    Asus P5Q PRO TURBO
    Bios sees chip just fine
    Windows booted once with incorrect MHZ value, so I ran a couple of test. Speed seemed ok.
    I rebooted , now Windows 10 just gets to windows icon and no more boot.
    Put old processor in, everything still works.

    My guess, my BIOS does not have the MicroCodes for the chip.
    I dont feel like messing with BIOS, so I will get the Q9650 that I know works

    Cheers

    Reply
  • Brian January 5, 20184:47 am

    Asrock 775i65G v2.0 Intel 865G chip set works fine with a Xeon 3230.

    Asrock 945GCM-S intel 945GC does NOT work with Xeon 5460 and does NOT work with Xeon 3230

    Reply
  • Alexander January 7, 201812:32 pm

    Could someone tell me would Asus p5kpl se work with Xeon E5460 ? Table on this site tells that it was tested with 5430 and 5450, but also tells that motherboard compatible with all xeons.

    Thanks

    Reply

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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.