Editing Smartphone (section)

===Central processing unit===
Smartphones have [[central processing unit]]s (CPUs), similar to those in computers, but optimised to operate in low power environments. In smartphones, the CPU is typically integrated in a [[CMOS]] (complementary [[metal–oxide–semiconductor]]) [[system-on-a-chip]] (SoC) [[microprocessor|application processor]].<ref name="Kim"/>

The performance of mobile CPU depends not only on the clock rate (generally given in multiples of [[hertz]])<ref>{{cite web
 | title = CPU Frequency
 | work = CPU World Glossary
 | publisher = CPU World
 | date = 25 March 2008
 | url = http://www.cpu-world.com/Glossary/C/CPU_Frequency.html
 | access-date =1 January 2010 }}</ref> but also on the [[memory hierarchy]]. Because of these challenges, the performance of mobile phone CPUs is often more appropriately given by scores derived from various standardized tests to measure the real effective performance in commonly used applications.