PFN: Processor Family Number

This location contains seven ASCII characters reflecting the Intel® family number for the processor. This number is the same on all Intel® Xeon® E7 v3 processors. Combined with the Processor SKU Number shown next, this is the complete processor part number. This information is typically marked on the outside of the processor. If the part number is less than 15 total characters, a leading space is inserted into the value. The part number should match the information found in the marking specification. Writes to this register have no effect.

For example, a processor with a part number of AT80604******** will have the following data found at offset 44-3Eh: 41h, 54h, 38h, 30h, 36h, 30h, 34h.