First off, always remember an important Internet axiom: Your right to be taken seriously is forfeit if you quote Wikipedia.
Wikipedia is rife with misinformation, bad information, and flat out WRONG information. It's made by people just like you and me, who may like to think we know more on a subject than we really do.
Case in point: you clearly do not understand the difference between logical and physical processors, because the Wikipedia article is actually correct, and answers your question. I could give you the answer, but then you wouldn't learn the difference between physical and logical CPUs, so I will instead point you in the right direction and let you find the answer on your own.
I am planning to purchase Windows 7 Home Premium 64 bit with Intel(R) Core(TM) i7-740QM Processor(1.73GHz,4Core/8Threads,turbo boost up to 2.93Ghz,6M cache) processor.
Will Win 7 Home Premium utilize all the 4 Core/8 Threads ?
Read here : http://en.wikipedia.org/wiki/Windows_7#Multi-core_processor_and_multiprocessor_limits
Is there any limitation ? Or will it work utilizing all the 4 Core/8 Threads ?