What is the difference between various xeon x5680 CPUs

[idata]

I am confused regarding the difference between these two xeon 5680 CPUs:

Manufacturer Part # AT80614005124AA

and

Manufacturer Part # BX80614X5680

According to the specs here:

http://www.pcsuperstore.com/products/11108416-Intel-AT80614005124AA.html http://www.pcsuperstore.com/products/11108416-Intel-AT80614005124AA.html

and http://www.pcsuperstore.com/products/11108316-Intel-BX80614X5680.html http://www.pcsuperstore.com/products/11108316-Intel-BX80614X5680.html

there are differences, most notably support for, or the lack of support for SIMD.

Are they really different? I intend to use these CPUs on a workstation, rendering video and 3D rendering, not on a server. I will use two CPUs on a EVGA classified SR2 mobo designed for two xeon CPUs.

My Norwegian dealer lists the # BX80614X5680 as "boxed", the other as "OEM", but I have no clue why one is boxed, because none of them come with a fan (cooler) as I am used to.

Ingvar

[DSilv11]

Both part numbers should contain a SLBV5 (X5680) processor. (Identical processors)

AT80614005124AA is packaged in a (OEM) bulk pack tray (10 or 12 processors)

BX80614X5680 is the retail single pack processor

Just don't ask me why they charge more for a processor out of a bulk package than a processor in a retail box.