Just to clarify,
I am using Catalyst version 14.4.
AMD Catalyst Control Center Version - 2014.0915.1813.30937
Driver Packaging Version - 14.10.1006-140417a-171099C
My system information:
OS Name: Microsoft Windows 8 Pro
Version: 6.2.9200 Build 9200
System type: x64-based PC
Processor: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz, 2793 Mhz, 4 Core(s), 8 logical processor(s)
We stopped supporting Windows 8, i would recommend updating to Windows 8.1. It's a free upgrade and that means you can benefit from regular driver updates.
You do not have a switchable graphics system, so that's why you don't see a Power tab. You did not mention what AMD discrete graphics card you are using.