CPID
From The iPhone Wiki
Not to be confused with CHIPID, the CPID tag (ChiP ID) indicates the processor type.
List of CPIDs
- S5L8900: 8900
- S5L8720: 8720
- S5L8920: 8920
- S5L8922: 8922
- S5L8930 (A4): 8930
- S5L8940 (A5): 8940
- S5L8942 (A5 Rev A): 8942
- S5L8945 (A5X): 8945
- S5L8950 (A6): 8950
- S5L8955 (A6X): 8955
Recovery Mode string
If you connect a device in Recovery Mode to your computer, there is a small section in the device's USB "serial number" that contains the CPID, among other information.