Hi all,

Please explain me the difference between PPC and Other arch like x86 or ARM
processing wise how differently Power Pc and X86 executes the instructions.
What are the difference b/w Power PC and X86 performance wise and which should be used?

You could write a Ph.D thesis on that question. Have you done any searching on the subject?

The only concise answer I can give to this question is to quote Half Man, Half Biscuit:
I'm not even sure what you mean by the Intel x86 arch has changed quite a bit over the years and you could even write quite a learned piece on the architectural differences between x86s from Intel, AMD and Via. And architecturally, current x86s (generically) are wildly different from ARMs, although you might consider a fairer comparison to be Atom versus ARM (and again there are significant diferences between, say, an ARM7 and a Cortex M3).

And, of course, there are rather different answers if you mean systems architecture rather than CPU chip architecture.

So, if you want any kind of specific answer, you'll have to ask something more like a specific question. You might, for instance, be interested in performance and that would flavour your answer in one way. On the other hand, for a typical deeply embedded app you would probably have a different set of priorities altogether and that would flavour your answer in a different way. Of course, if you are studying Computer Science you might be trying to take a rather high-minded, but impractical, 'don't bother about the applications, just compare and contrast' position.

And, because you can never have to many Half Man, Half Biscuit quotations (even if it is the same one as previously, just in bold):

http://en.wikipedia.org/wiki/PowerPC

http://en.wikipedia.org/wiki/X86

http://en.wikipedia.org/wiki/ARM_architecture

search for other architectures as needed.

one is RISC, one is CISC. which powerPC do you want to program anyway? (macs are intel these days, you know... is it the Cell?)