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

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1,919 Comments

Troubleshooting Problems

What you should try first

Make sure:

  • You're running the latest BIOS.
  • And have FULLY reset your BIOS (use the 3-pin motherboard reset jumper, and then load the default BIOS settings on the first startup). For more details, see the previous link.

Fully resetting your BIOS will fix most problems, but if it doesn't, try the following solutions:

Solutions to common problems

I'm getting a message during bootup telling me to update my bios (on some boards, it may instead complain about an unsupported CPU). After hitting F1 (or some other key), the system will then boot and seems to work fine.

Note: Make sure you try the things mentioned in What you should try first if you haven't already.

This usually happens because your motherboard doesn't contain the exact Xeon microcode for your processor, and it's using the similar LGA 775 microcode instead.

This typically isn't a problem (except for the annoying message), and your system will normally function fine. You can usually stop this message from slowing down your bootup by disabling Halt boot on error in the bios. However, you can also add the LGA 771 microcode to your BIOS to stop this message from appearing.

If you are experiencing any other problems besides the error message, please take a look at this topic.

Windows 8.1 won't install

Note: Make sure you try the things mentioned in What you should try first if you haven't already.

If Windows 8.1 won't install because it says your processor is missing some functionality (like CompareExchange128), the following information should help you to get it installed.

Make sure you're running the latest BIOS

These problems are usually due to do outdated CPU microcode in the BIOS, so if you haven't tried already, make sure you're running the latest bios.

If you have the latest BIOS installed, try adding the latest LGA 771 Xeon microcode to your bios

The latest LGA 771 Xeon microcodes should contain all of the functionality Windows 8.1 needs, so we recommend adding these microcodes to your BIOS. Multiple people have successfully installed Windows 8.1 after doing this.

Full details on adding the microcodes are available: here.

My system won't boot due to an unrecognized CPU error

Note: Make sure you try the things mentioned in What you should try first if you haven't already.

  1. Fully resetting your BIOS will usually fix this problem.
  2. If this doesn't help, try the things mentioned here.

Windows crashes during startup

Note: Make sure you try the things mentioned in What you should try first if you haven't already.

Loading the default settings in the BIOS has solved this problem for most people.

If that doesn't help, this problem is also sometimes due to the SATA hard drive mode getting reset when you reset your BIOS to its default settings. If this setting is different than what is was when you installed Windows, Windows will likely fail to load. The options are usually AHCI, IDE (sometimes listed as ATA), and RAID.

If this doesn't help, please try what's suggested here. It's also relevant to this problem.

My system seems very slow

Read this

My system is unstable (crashing, freezing, rebooting)

Read this

My CPU fan is always spinning at full speed and is very loud

Note: Make sure you try the things mentioned in What you should try first if you haven't already.

This problem is usually caused by not fully resetting your BIOS.

If you're still having problems after trying that, you should also try the solutions mentioned here.

My system is overheating (or running hotter than expected)

Note: Make sure you try the things mentioned in What you should try first if you haven't already.

Your temperature monitoring program may be telling you the wrong temp

Some temperature monitoring programs don't report the correct temperature for Xeon processors, so your CPU may not be running as hot as you think. The reason this happens is they're using the wrong tjmax value, which is used to calculate the current temp.

AIDA64 should read the correct temperature by default (the temps are under Computer -> Sensor). However, you can also manually set the tjmax in many monitoring programs, which should make them also report the correct values.

Fully resetting the BIOS or adding the Xeon microcode can also sometimes help with temperature reading errors

More details available: here.

You may need a better heatsink and fan

If none of that helped, you may need a better heatsink and fan. Intel usually gives smaller heatsinks for their dual core processors, so if you were previously using one of those and upgraded to a quad core Xeon this may be the problem.

Error message saying my CPU's wattage is too high, and system won't boot

Note: Make sure you try the things mentioned in What you should try first if you haven't already.

You'll usually get this message if you try to install a 120 W processor into a motherboard that only supports 95 W or below.

However, if the TDP of your CPU is actually low enough (and you're still getting this message), adding the latest Xeon microcode to your BIOS will probably fix this message.

If this doesn't help, you can usually bypass this message by pressing F10 or some other function key (it may vary based on your motherboard).

My system will boot up (to at least the BIOS), but my Xeon is not working as expected (or is missing functionality)

Note: Make sure you try the things mentioned in What you should try first if you haven't already.

This section should help if your:

  • Processor is missing functionality (like Speedstep, SSE 4.1, VT-X, or CompareExchange128)
  • System seems very slow and doesn't seem to be running at full speed
  • System is unstable (crashing, freezing, or rebooting)
  • And probably many other problems

Things you should try:

 

Try adding the latest LGA 771 Xeon microcode to your bios

How to add LGA 771 Xeon microcode to your BIOS

If your system is still unstable or seems very slow, try disabling the power saving features in your BIOS

The power saving features like Speedstep (aka EIST) and C-States (C1E and others) may not be working correctly with your motherboard, and it could be causing your processor to run at its minimum speed or causing instability. You should try disabling them to see if it helps.

You can test what speed your CPU is running at with CPU-Z. It should run at full speed if you run something stressful like a benchmark or AIDA64′s system stability test.

If you're still having stability problems with the Xeon, try increasing the CPU voltage or decreasing the CPU speed

If you're still having stability problems at this point, your motherboard may be at its limit speed or power wise, or your Xeon may no longer be stable at its stock frequency and voltage. This can happen over time as all processors eventually degrade with use.

I recommend increasing the CPU voltage in the BIOS. This may make your system more stable. If you aren't able to alter the voltage (or don't want to), try decreasing the CPU ratio (sometimes called the multiplier) or reducing the FSB speed. This will run the processor at a slower speed, which may make your system more stable.

If that doesn't help, you may need to adjust other voltages or speeds related to the chipset, FSB, or memory. If you're not familiar with how to do this, I recommend searching for a core 2 quad overclocking guide. Even though you're not overclocking, it should cover what to adjust to get your system stable.

If your system is still unstable at this point, try reinstalling your old LGA 775 CPU to see if it still works

If your system works with your old processor, your system probably wasn't damaged during the mod. However, we have heard of two cases where a socket pin was bent or broken, which caused the Xeon processor to not work correctly, but the old LGA 775 processor still did. So, you should definitely check for broken pins.

However, if your old processor doesn't even work correctly, make sure you've fully reset your BIOS. If it still has problems even after resetting, read this.

And if none of that helped, try reinstalling Windows

Your Windows installation could have gotten corrupted, which could be causing problems. Reinstalling Windows has helped for multiple people that were having problems like rebooting, BSODs, or other lockups.

I'm just getting a blank screen when I turn on my computer

Note: Make sure you try the things mentioned in What you should try first if you haven't already.

Make sure your motherboard is compatible with your Xeon

If your motherboard has an incompatible chipset, your bios doesn't support an LGA 775 processor that's similar to your Xeon, or your Xeon's TDP is higher than your motherboard will allow, your system will likely fail to boot up correctly. This is explained in the motherboard compatibility section earlier in this guide.

However, you may still be able to get the system to boot up by doing a bios mod. Please see the previous link for details.

Check for the following common installation problems, and try the installation again

  • Make sure the 2 plastic tabs are fully cut off and removed from the socket. If they aren't, the Xeon may not seat correctly in the socket, which is mentioned next.
  • Make sure the processor is fully seated in the socket (try wiggling it slightly). This is a common problem that often happens if the plastic tabs in the socket are not cut off fully (but it could still happen even if they are). If the processor isn't seated correctly, it will not be able to make contact with all of the pins in the socket, and the system will likely fail to boot.
  • Adapter not lined up correctly on the bottom of the Xeon. If the placement is off by even a little or covers something it shouldn't, you'll likely run into problems. Use a magnifying glass to verify the adapter is aligned correctly.
  • Adapter is not tightly attached to the processor. If the adhesive is weakened, the adapter may move when installed in the socket, which can cause problems. Try pushing on the top and bottom of the adapter a little to make sure it doesn't move.
  • Top-right edge of the adapter is too long and covers some of the pads on the processor. If this happens, you'll need to cut the top-right edge to make it shorter.
  • A pin in the socket is bent. It's possible some of the pins got bent when you were removing the two plastic tabs from the socket. If you notice bent pins, we recommend that you try to straighten them using tweezers and a magnifying glass (a small knife may also help).

Even if none of these seem like the problem, I still recommend rereading the installation instructions carefully and trying the installation again. You may notice something or fix some issue that you missed the first time.

Try adding the LGA 771 Xeon microcode to your BIOS

Most motherboards should work fine if your bios supports one of the similar LGA 775 CPUs mentioned in the motherboard compatibility section. However, it is possible your motherboard may need the exact LGA 771 Xeon microcode in order to function properly. This microcode can be added with a bios mod. You can find more details on obtaining a bios mod for your motherboard at the previous link.

Try reinstalling your old LGA 775 cpu

If you're still having problems, you should reinstall your old LGA 775 cpu to make sure your system is still working correctly.

If your system works with your old processor, your system probably wasn't damaged during the mod. However, we have heard of two cases where a socket pin was bent or broken, which caused the Xeon processor to not work, but the old LGA 775 processor still did. So, you should definitely check for broken pins.

However, if your old processor won't even work, please read this.

If you're still having problems

If you're still having problems after trying the above fixes (including the bios mod), you can try the following as a last resort.

Try another adapter

The adapter may be defective, so I recommend contacting the seller for a replacement.

If that doesn't work, try another Xeon processor

If you're still having problems with the replacement adapter, your Xeon CPU may be defective, so I recommend returning it for another.

My old processor no longer works

Note: Make sure you try the things mentioned in What you should try first if you haven't already.

The most common cause of the old processor no longer working is bent socket pins. It's possible some of the pins got bent when you were removing the two plastic tabs from the socket. If you notice bent pins, we recommend that you try to straighten them using tweezers and a magnifying glass (a small knife may also help). We've also heard that you can use a mechanical pencil for fixing bent pins.

If bent pins aren't the issue, make sure the socket doesn't have any stray pieces of plastic (from when you removed the tabs). It's possible this could be stopping the processor from seating correctly in the socket.

If neither of these help, we recommend that you try to install your old processor again. It's possible it wasn't making a connection with all of the socket pins. Wiggling the processor when it's in the socket can sometimes help.

1,919 Responses

  • blAck January 11, 20186:56 pm

    Intel DP35DP
    Xeon 5xxx – no way, not even try to start with 771 CPUs.
    Added all needed ucodes with HW programmer but it not help.
    Tried to run with negative result: X5450 [SLBBE], E5450 [SLANQ]

    Reply
  • Андрей Андросов January 13, 201811:11 am

    MSI P45-C51 есть ли поддержка платы процессоров XEON?

    Reply
  • sinair January 13, 20181:49 pm

    A placa-mãe do pc é sti semp toshiba sti 007030 chipset g41 fsd 1066 cpu fsd1333, comprei uma cpu xeon x5460 , 3.16 mhz 12 de cache fsd1333 tecnology 45 nm , max 95 w e quando ligo não inicia , o windows, pc desliga, a minha fonte e 450 watts. segundo tecnico, , xeon é para servidor , acredito que seja compativel o processador vem com adaptador tranfere lga 771 para 775 embutido, o que fazer ?

    Reply
  • Darkzy January 14, 20186:09 pm

    Just completed on a Asus P5KPL-AM IN/GB/SI – used 0506 version bios with Microcodes embedded in, using MMTool (AMI Bios)

    X5460 currently installed Win 8.1

    Something to note, even with V-0506 BIOS would not boot Win 8.1 installer and would not allow Windows 7 install either until Microcodes were applied to Bios manually.

    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.