Core frequencies can very depending on load and power savings settings.
Here is some info on that... http://www.cpu-world.com/Glossary/C/CPU_Frequency.html
Here is some info on that processor. http://www.cpu-world.com/CPUs/Puma/AMD-A8-Series%20A8-7410%20-%20AM7410JBY44JB%20-%20AM7410JBY44JBD....
They have the ability to clock independently based on load placed on each core, which saves power but also allows Turbo Boost to work.