4cf306ce_a_620___Phone_specs_comparison__Hardware
[2] Qualcomm Snapdragon S4 Plus MSM8227 [Hardware] 
System chip System chip - Most modern handsets use an advanced chip that includes many of the device’s hardware modules like the processor, Wi-Fi, Bluetooth and sometimes even the wireless radio. This field shows what particular system chip (or System-on-a-Chip) is used in the phone.
Nokia X7 vs Nokia Lumia 620 - Phone specs comparison