Yes. Think of it as firmware updates, and in order for the two processors to work together as one computing unit, they must speak the same language and have all the same features and code.
Hi all. I have dell 2950 with stock e5320. I added E5440 to second slot but dell showing error. So i put E5440 to first stot and remove E5320. Now i think to buy second processor L5420 Can this server work with E5440 in 1slot L5420 in 2slot.  Or both processor need have same version (like 2x E5440).Or i can mix two processors? I suppose that e5450  can't  work with e5320 by fsb (1333 vs 1066)
Dell 2950 III Processor compatibilty. - two different processors