4cf306ce_a_620___Phone_specs_comparison__Hardware
[1] Single core, 680 MHz, ARM11 [2] Dual core, 1000 MHz, Krait [Hardware] 
Processor Processor - The processor is the main computing component of a phone and is a major factor when it comes to the overall speed of the device. Some more powerful smartphones use dual-core and quad-core processors designed to deliver greater performance.
Nokia X7 vs Nokia Lumia 620 - Phone specs comparison