Intel Core i5-2520M and The Asus K53E Notebook

As you can see, this processor has rather wide scope of clock frequencies, from as low as 800MHz at idle on the desktop, to 3.2GHz under a momentary single-threaded burst requiring a quick snap of extra torque. Intel likes to call the new 2nd generation Core series processor's ability to achieve this level of clock gating, "HUGI" or "Hurry Up and Get Idle."  Otherwise know by it's marketing name as Turbo Boost 2.0, the aggressive momentary overclocking and downclocking of the chip allows it to attain peak performance under a myriad of threaded or non-threaded workloads.

And finally, here's what the Core i5-2520M looks like under full load with all cores and threads exercised at 100% utilization.  The processor is pushing 2.9GHz, in round numbers, and maintained that clock speed under continuous load in our Cinebench benchmark loop.  Remember though that manufacturers, depending on the thermal requirements of their system, may elect to set the max Turbo Boost frequency lower if they so choose.

And here is the rest of the 2nd generation Intel Core i5 family of Sandy Bridge-based notebook CPUs.  Don't ask why Intel decided to drop in the Core i5-2537M model number for their lower-power 1.4GHz chip.  It doesn't make sense to us either but that's that way things are listed in Intel's decoder ring.