Whats the difference & better between the Intel 4th Generation Core i3 & the Intel 3rd Generation Core i3 ? im looking at the HP - Pavilion 17.3" Laptop - 4GB Memory - 750GB Hard Drive , But one has the Intel 4th Generation Core i3 and its $ 399.99 & The other one has the Intel 3rd Generation Core i3 Which is $379.99 same laptop just different intel generation...