Android OS from ICS and above has a "power saver mode" by default (I own a samsung) What does this mode actually do?
If it reduces clock speed of cpu, then by how much?
How does it attain this power saving? By limiting cpu? Gpu?
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I think this is a manufacturer specific feature, not an Android feature.
My Nexus 4 running 4.4 has no power saver mode.
My HTC One running 4.4 does have a power saver mode and although I can choose what aspects of the phone I want to limit to conserve power, I am not told how / what they do to save the power. I guess this will be chosen and set per manufacturer but for example, on my HTC device in power saver mode the options are;
CPU Power Conserve CPU usage
Display Reduce screen brightness
Vibration Turn off vibration feedback
Data connection Put to sleep when screen is off
Have you had a look in your settings menu? It may well tell you in there what is being limited.