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

MODs

2,110 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 $15 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

2,110 Responses

  • Stelios March 14, 20182:27 pm

    Asus P5N-D with X5460 SLANP.

    I got the error message after following the instructions that the BIOS needed update as the CPU is not recognised.

    Pressed F1, Windows 7 loadded, some minutes later blue screen. Twice.

    I had 1401 version (latest) on BIOS. Updated again with modded 1401 version of BIOS dowloaded from here

    http://genius239239.myweb.hinet.net/771/

    Now Windows 7 64bit informs me that new CPU is installed, X5460!!! Wooohoooo!!! Thank you people!!!!

    Reply
    • Stelios March 25, 20182:01 pm

      NO! I got all the times memory managment blue screen (0x0000001A). I checked all my hardware no fix until I removed the X5460. After that everything worked fine. Too bad. Maybe I should decrease the FSB?

      How could I do that?

      Reply
  • Mehdi March 15, 201811:11 am

    Oh , well , Cpu-Z is telling me it is a 620i chipset but the others websites are all saying that it is a 610i chipset , also it’s still a GeForce7050 , i think it’s not the real problem here …

    Also , the 620i chipset don’t seem to “exist” , i always find 610i chipset related things when i write “620i”

    I’ll try to put a x5460 in it (which has a way powerful tdp) to try if it work

    IF IT DOES

    Could i change the X5460 to a way lower TDP “E5450” ?

    That’s my real worry …

    Also thanks for replying

    Reply
  • Morteza March 16, 201810:52 am

    Thanks for your helpful.
    I want use Xeon E5462
    I have gigabyte P31-DS3L, P35, P43-ES3G.
    I UPDATED AND MOD AND ADD MICROCODE TO ALL MOTHERBOARD’BIOS.
    now, P31 does not recognises E5462////p35 recognises E5462 but windows 10 64 bit can not load////p43 recognises E5462 and windows 10 64 bit fully loaded.

    All the motherboard is listed in your site that recognises E5462 but I don’t know what is the problem.

    Help me

    Reply
  • xxMADXx March 16, 20181:51 pm

    I have an Inspiron 530 dg33m03 and am running a E5450 with this mod.

    I just need someone to guide me through adding micro code for processor to 1.0.18 bios so I can use 8gb ram and 64bit operating.

    If you have done this mod please send me info on bios mod.

    Reply
  • AceFlash March 17, 201812:30 pm

    Hey,

    since i flashed the BIOS i always the the CMOS Checksum error. I tried to replace a fresh battery etc. but it still gives me the error.

    Any way to fix?

    Reply
  • Greg Sessing March 18, 20184:37 am

    I’m running an E5450 on an HP IPIBL-LB with the DX2400 5.37 bios. I originally tried the 5.43 bios from another HP that supposedly uses the same board, but it corrupted my bios AND the chip is SOLDERED in, so unless you can micro solder, good luck with that. The only bug I have is the CPU fan control runs it at FULL speed which is way too loud. I was able to unscrew the 80mm fan from the HS and mount a very quiet Silenx 3pin that keeps this 80watt CPU very cool running OCCT. HP says this IPIBL-LB is an ASUS, but CPU-Z and Passmark PerformanceTest both say it’s a Pegatron 2A73

    Reply
  • Vobexo March 21, 20185:04 pm

    I try to run a Xeon 3363 in Fujitsu Celsius W370, Q45 Chipset. Mainboard d2817.

    intel ® Q45 Express, intel ® 82801jo iCh10do

    After Microcode update and Bios reset, the Bios Post show the Xeon 3363 correct, but the Fans running on fullspeed and Win 10 starts slow and a Bluescreen appear.

    i forget to change HD settings to AHCI Mode and now it dont start with AHCI and SATA anymore.
    i try to load Macrium Reflect Backup CD for recovery, but it hang up befor Macrium full starting.

    ???
    Thanx for Help and sorry for bad english!

    Reply
  • Steve S-T March 21, 20188:37 pm

    Hi all,

    I have an ASUS P5P41D motherboard and have just installed an X5460. I can get on the Bios menus with no issues but once the blue Windows logo appears (Windowns 10) everything freezes and the lights go off on the keyboard.

    Even when trying to boot into repair mode it just freezes. Before I did the install I checked and the mobo should work fine with the new CPU based on all the info that I could find.

    Any suggestions?

    Reply
  • Igor March 22, 20186:10 am

    MB ASUS P5Q with latest BIOS 2209
    CPU X5472 works well,recognized properly,FSB set to 1600 automatically
    no problems at all,cpu temperature 32-33°C with OCZ Vendetta cooler
    still haven’t managed to overclock it,but it must be possible…

    Reply
  • hyan March 22, 20188:19 am

    have mobo p5ql pro, really confused between x5470 vs e5450 or x5460 too,is tat extra 0.33 ghz speed really matters? as 5470 is expensive for me. waiting for its price to be reduced,by the way pls tell me 5470 wud reallly make difference from others. i use internet with many pages,play medium games ..mostly counterstrike,watch hd videos,thats all are my usage. thanks,hope i get a convincing reply. :)

    Reply
    • hyan March 22, 20188:20 am

      oh yeah ,i don wnaa overclock,so i would wana try to put in stock cooler first and see the temp,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.