What's the main difference between normal Resolution and High Res in Smoke ?

Support Particles and Physics Simulations
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I can’t find the answer !!!

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http://wiki.blender.org/index.php/Doc:2.6/Manual/Physics/Smoke/Domain#Smoke_High_Resolution_options

The High Resolution option lets you simulate at low resolution and then uses noise techniques to enhance the resolution without actually computing it. This allows animators to set up a low resolution simulation quickly and later add details without changing the overall fluid motion.Various methods for this are available, including the default: Wavelet, which is an implementation of ‘turb.php|Wavelet Turbulence for Fluid Simulation’

Resolution/Divisions
Enhance the resolution of smoke by this factor using noise.

Smooth Emitter
Smoothens emitted smoke to avoid blockiness.

Show High Resolution
Show high resolution using amplification.

Noise Method
Wavelet
FFT

Strength
Strength of noise.