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The following web site will help you determining which processor family is the one better meeting up your needs. Please find this web site, here: http://www.intel.com/content/www/us/en/processor-comparison/how-to-choose-the-right-processor.html
The system performance is dependent on the entire system configuration, at a hardware and software level; however, the previous web site takes into consideration the usage you will be giving to the system.
Intel(R) Core(tm) i3 and i5 processors are addressed to a more business related environment while the Intel(R) Core(tm) i7 processors are more gaming, intensive video usage related.
If needing information on Intel(R) processors, you can go to: http://ark.intel.com/
Any questions, please let us know.