ARM and x86 come from a similar original purpose, the creation of a powerful, flexible instruction set architecture that can be used on modern personal computers. The technologies made a clear split, however, when x86 won that space , ARM was nudged aside.

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Benefits and downs of these architecture.

To me both of these architectures are subperb, they both are the best in different enviorments, The x86 is leading in the performance area by a long shot in the pc enviornment, but the ARM is the leader in Embbedded PDAs, notebooks and etc. due to the Low power consumtion of the processor. the x86 in leading in high performance and has not quite got it together on lowering its power consumsion.
Now the good thing is that as far as priceing goes the ARM you may get for a tad bit smaller fee then the x86, which you have to purchase, unlike the ARM achitecture..

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x86 Cores???

x86 are mainly today a dual-core processor that can handle most common computer tasks, like browsing the web, sufficiently. However, computer programmers may find new ways to take advantage of the three or more cores in multi-core processors to do new things that dual-core processors won't be able to handle. Dual-core processors are generally less expensive than other multi-core processors, but if the price is negligible, the more cores, the better.

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Interesting facts

Whats most interesting to me on this particular subject is that Intels x86  is effectively Intel's. The company guards the instruction set architecture. AMD and Intel both have the ability to develop and build new x86 processors, but only because of old licensing argeements. Modern embedded designs have multiple processors, multiple caches, multiple threads handling graphics and files... and single-threaded file systems that have to handle all that data. Using flash media, using a multi-threaded file system will eliminate this bottleneck and can give a solid performance improvement by allowing parallel access to files.

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