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A friend and I are both getting laptops before we leave for university in the fall, and i'm a bit unsure on what to look for in terms of processor. I see the usual p4 in the 2.5-3ghz range, but I also see alot of Centrinos in the 1.5-1.8ghz range. I know Centrino processors have a longer battery life than regular, but are there any other major differences? How does a higher speed Centrino compare to a higher speed p4? Are there anything major things I should look for? Thanks in advance.