How to get the CPUID, Stepping, or sSpec for an Intel CPU



In this guide we're going to show you how to look up the CPUID, stepping, or sSpec for an Intel processor.

The method is different depending on whether the CPU is already installed or not.

Definitions (in case you're interested)

  • Stepping - This is basically the CPU's version number. Whenever Intel improves the manufacturing process, they make a new stepping. Steppings are typically two characters long (like C0, C1, or E0). It's also sometimes called the revision.
  • CPUID (CPU IDentification) - This is an identification string (like 1067A) that allows software to find out what features your processor supports (stuff like SSE, MMX, VT-X, etc). All processors from the same stepping have the same CPUID.
  • sSpec (specification number) - Unlike CPUID, each stepping of a processor has their own unique 4 or 5 character sSpec string (like SLBBM).

How to get the CPUID and stepping if the CPU is already installed

You can use AIDA64 to get the CPUID and stepping for your processor.

Getting the CPUID with AIDA64

Look in the Motherboard category on the left for the CPUID information. There should be an entry called "CPUID Revision". That's your CPUID (if you remove the 'h' at the end). The h just means it's a hexadecimal number, but that isn't part of the CPUID.

Getting the stepping with AIDA64

The stepping is also located within the Motherboard category, but it's in the CPU subcategory. It should be listed as "CPU Stepping".

How to get the sSpec if the processor hasn't been installed yet

The sSpec is printed on top of the processor and also on the side of the retail box.

As mentioned earlier, the sSpec is 5 characters long (it can be shorter for engineering samples). For example, SLBBM is one of the sSpec for Intel's Xeon E5450.

How to get the CPUID, stepping, or sSpec if you already know one of these

If you already know the CPUID, stepping, or sSpec for your processor, you can use that information to look up the others. If you don't know any of this, you should first use one of the other methods mentioned earlier.

Getting this info for quad core LGA 771 or LGA 775 CPUs

If you have one of these CPUs, you can find the CPUID, stepping, or sSpec on the following page: List of LGA 771 & 775 CPUs. If you have a different processor, scroll down for an alternate method.

Where is the CPUID located on this page?

The CPUID is the same for all processors with the same stepping, so you'll want to look in the CPU steppings table (there's a link to this in the table of contents at the top of the page).

And if you don't know the stepping, look for your CPU's model number in the main CPU table.


For example, if you know your sSpec is SLBBM, just search the page for SLBBM or your Xeon's model number. You'll see the stepping right next to the sSpec in the table. In this case, the stepping is E0. If you then scroll to the CPU steppings table, you'll find the CPUID for that stepping, which is 1067A for the E0 stepping.

Alternate method (for other processors)

You can also usually find this information by searching for your CPU's model number on (use the "Search site contents" at the top-right).

Here's what we see for the Xeon E5450:

Core steppingsC0 (Q5YQ, SLANQ)

If you know your sSpec is SLBBM, you can easily tell from this table that your CPUID is 1067A, and your stepping is E0.

Similarly, if you know your CPUID is 1067A, you can tell your sSpec is either QFUF or SLBBM. Engineering samples usually have an sSpec starting with Q, so if you have a normal retail processor, your sSpec is SLBBM.

35 Responses

  • Robby March 20, 20153:03 pm

    I was directed to down load a .rar from this place!PkhxGaha!sbllkpc_xEU7CUPmZo1yVj21hD71OCbBonGyD1Y6bp4
    but I do not know how to extract it for the Asus ez flash – any help ??
    thank you

  • Martin May 20, 20157:00 am

    Thanks for your help !
    I already changed LGA775 cpu to Xeon X3363 LGA771 on a Asus P5K Deluxe and it’s work realy well, very fast.
    I bought 2 Xeon X3363, the first that i tryed, my PC dont boot with it. Then i tryed the second and that one boot but overheating. Then i stop it, to update my Bios files using MMTOOLS. The Pc reconize the 2 Xeon now and work realy well at 43 degres C.
    I build my own Pc 2 months ago (big set up, Asus Z87 Pro, i7-4790K and Ram 2400Mhz) $1600 and now my old Pc almost reach the performances of my new for $125 (Xeon X3363 + some Ram) :(
    many thanks again for your help, it was funny and many stress to do that !

  • Derek Schmidt April 21, 201612:47 am

    So – I tried the mod with a ECS G43T-DM1 vA00 mobo and a Xeon E5450 (SLBBM). Booted once into W10 which was what I had on it before the mod. Booted again but hung on W10. Tried several more times and kept hanging, alternately telling me it was starting repair process. Read trouble shooting and figured I would reload Windows 7 from disk then try upgrading to 10 again. Got 7 on fine, but it now says processor does not support some functionality of W10. Is this truly an issue with Xeon 5450, or is there a work- around?

    • Derek April 21, 20161:03 am

      forgot to add it was W7 64 bit that I was upgrading from, not sure if that matters.

  • Róbert Zsiros March 28, 20171:38 pm

    Hello. I have problems, I can not start ga EP45 DS4 motherboard, cpu xeon e5472. I know this is not good BIOS microcode. Can you help me mod bios? thanks in advance.

  • peter April 2, 20171:01 am

    I have a Foxconn G41S-K v2 i’ve tried E5450, E5420 the pc turn on and show that message ‘Warning!!!
    This motherboard only supports low power energy-saving CPUs (less than 65W)
    Your current CPU is not supported, and the system will shut-down soon.
    Please visit Foxconn support website for supported CPU information.”
    of course after some seconds turn’s off. So i’ve tried L5430 (50W) no matter that i uptated the bios with the cpuid’s of all these cpu’s the same message so you can write that doesn’t support any 771 cpu.

  • Tamas August 13, 20171:17 pm

    I have a P5B-VM motherboard, I’ve added an X5450 processor. I did everything I did here but did not want to give me a picture … what’s the problem?

  • Dan September 12, 20182:59 pm

    I have a Xeon E5472 installed on an Evga 750isli-ftw and it works. Updating the bios with the microcode for this cpu, I see the ID is listed 10676 but the revision 60C is not. Should I go through with update?

  • alexandre April 26, 20208:17 pm

    nao a bio do meu xeon x5450 slasb. e uma 10676h toda que achei e so 10676

    • marcos June 19, 20203:12 pm

      Deve usar a 10676, a letra h no final pode desprezar, é por causa do hexadecimal. Abs


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