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 $24 (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


Leave a reply
  1. Federico

    Hi. I installed a Xeon E5440 on a ECS GF7100PVT-M3 (V1.0), and it worked fine. Regards.

  2. Armando

    I have a Asus P5G41T-M LX2BR and I would like to know if is compatible with Xeon X5450 Socket 771 with adapter.
    I found this motherboard below inside the motherboard compatibility and tested motherboards link, which may be same, but I’m not sure, Is this my motherboard? I don’t find the number “7” after the letter “m”
    on Asus website from US and BR.

    ASUS P5G41T-m7 Lx2BR G41 / ICH7 ≥ 1333 ≥ 80 At least Q9550 (C0). Q9650 probably also supported. Probably all
    Worked: E5450

    Notes: •Couldn’t find cpu support list, so can’t verify if Q9650 or E0 steppings are supported

  3. Martin

    I have a GIGABYTE GA-945GCM-S2C and have successfully performed the mod and now use a Dual-Core 1333mhz Xeon X5260 CPU with this motherboard.

  4. sean

    I tried an e5450 e0 stepping in a rev 1.02 pegatron/ hp ipiel-la3,

    I added microcode before fitting the cpu but it was very very slow to boot or do anything (had to disable smbus driver in safe mode to install widows) although cpu-z showed all correct functions for the cpu it was unusable.

    The board does however support 16gb (4x8gb) ram when using an 800fsb cpu (only 8gb 4x2gb ram with faster cpu) it will run it at pc3 800/ 6400 speed though (g43-45 chipset officially supports 16gb ddr2 800 or 8gb ddr3 1066 but will treat ddr3 @ 800 as compatible )

  5. zamil86

    I have got Xeon x5460 (E0,SLBBA) and motherboard Intel Dg43gt(G43 Express chipset).Couldn`t find my motherboard name on this list,so want to know can i use this combination ? Thanks for review and answers

  6. Halny84

    MSI G31M2 V1 + E 5410 works fine

  7. Ignacio

    Hi, i confirm that a CPU L5408 works well with a motherboard ASRock 775Dual-VSTA (Bios 2.20a). Don’t need microcodes.

  8. 4merAMDFanBoi

    Hey guys, I’d like to add to the list of LGA 775 mobos compatible xeon cpu’s. I’m currently running an L5430 Xeon on an Asus P5G41T-M LX PLUS. Here is the CPU-Z validation link: http://valid.x86.fr/vi119h

    My following system specs:
    Processor (CPU)
    CPU Name Intel(R) Xeon(R) CPU L5430 @ 2.66GHz
    Threading 1 CPU – 4 Core – 4 Thread
    Frequency 2667.48 MHz (8 * 333.43 MHz)
    Multiplier Current: 8 / Min: 6 / Max: 0
    Architecture Harpertown / E0-Step (45 nm)
    Cpuid / Ext. 6.7.A / 6.17
    IA Extensions MMX, SSE, SSE2, SSE3, SSSE3, EM64T
    Caches L1D : 32 KB / L2 : 6144 KB
    Caches Assoc. L1D : 8-way / L2 : 24-way
    Microcode Rev. 0x00000A07
    Vcore 1.08 Volts
    Type Retail (Original Frequency : 2666 MHz)
    Model Asus P5G41T-M LX PLUS
    Socket Socket 771 LGA
    North Bridge Intel G41 rev A3
    South Bridge Intel 82801GB (ICH7/R) rev A1
    BIOS American Megatrends Inc. 0502 (10/21/2011)
    Memory (RAM)
    Total Size 8192 MB
    Type Dual Channel (128 bit) DDR3-SDRAM
    Frequency 533.5 MHz – Ratio 5:8
    Timings 7-7-7-20-1 (tCAS-tRC-tRP-tRAS-tCR)
    Slot #1 Module G.Skill 4096 MB (DDR3-1062)
    Slot #2 Module G.Skill 4096 MB (DDR3-1062)
    Graphic Card (GPU)
    GPU #1 Type NVIDIA GeForce GT 740 @ 1084 MHz
    GPU #1 Brand EVGA Corp.
    VRAM #1 Type 4096 MB @ 2500 MHz
    DirectX 11.0
    Storage (HDD/SSD)
    Model #1 SanDisk SDSSDX120GG25
    Capacity #1 120 GB
    Model #2 Western Digital WD My Passport 0730
    Capacity #2 1000 GB
    Screen #1 ASUS VH232H (ACI23F1)
    Screen #1 Spec 23.4 inches (59.4 cm) / 1920 x 1080 pixels @ 55-75 Hz
    Windows Version Microsoft Windows 7 (6.1) Professional 64-bit
    Windows Subver. Build 7600
    CPU-Z Version 1.73.0 (64 bit)

    • 4merAMDFanBoi

      Oh, I’d also like to add that I didn’t have to cut my motherboard with a razor because the L5430 Xeon cpu had pre-drilled holes to fit on an LGA 775 mobo. I bought the CPU off of ebay for $45 and it was shipped from a location in California (I live in Arkansas). I also didn’t have to change any microcodes or update the BIOS, basically what I’m saying is it was all “plug-and-play.” I was able to overclock the L5430 to 3.00Ghz stable, any higher than that the Xeon will get fussy on you. I’m also running a 300 watt PSU.

  9. Stefan

    Asus P5P43TD and Gigabyte EP45-UDR3 + XEON L5420 works fine

    Also, Gigabyte EP45t-UD3RL + 3353 !

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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.


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