Thehe processor (also called CPU, short for Central Processing Unit) is the "engine" of a computer. It is the most important component in determining how fast or 'snappy' the system will operate across applications both now and in the near future. Like the engine of an automobile, a processor can be fast, slow, power hungry or power efficient subject to the kind of work the computer is being considered for. It is important to round out what kind of things you will be doing on the system to best select a computer with a CPU most suitable to your needs.
Unlike other components of a notebook computer, the CPU is -- with rare exception -- a fixed component. This is in contrast to RAM and hard disk storage which can typically be upgraded. Therefore, another consideration is the fact that (important as the CPU is) the CPU you choose will be the same throughout the life of the system. This implies that as programs become more sophisticated, the computer's ability to handle such programs will be directly affected by the decision made at purchase all that time ago. This choice may mean the difference between a system that is useful for another year or two versus one that isn't -- much sooner. As a final consideration in choosing a CPU is the suggested or minimum requirements of either the programs that is planning on being run, or academic department recommendations as a guide as to the relative kind of performance required for a particular field of study.Let's take example as Intel Core i7 As Intel's flagship processor, the i7 is a 64-bit processor offering either 2, 4, or 6 cores of the highest levels of general performance available. The i7 combines Hyper Threading and Turbo Boost technologies for the most demanding and advanced of applications. Then, AMD Phenom II X6 AMD's Phenom II X6 represents the industry's first consumer class six-core processor. The X6 offers the highest levels of performance ideal for the most intensive of tasks - bolstered by AMD's new Turbo Core technology, the X6 is able to optimize performance in a variety of situations. But Intel Core i7 is slightly expansive than AMD but its performance is greater than it.