mercedes amg

Mercedes-Benz AMGBartos88May 5, 05:00 AMHi, I am currently deciding which 27" imac to get. With student discount the i5 3.1GHz would be 1.670,76 euro. For 1.846,88 (176 euro more) I could get the i7. I read that only the i7 has hyperthreading. Could someone explain in layman's terms what that means? Would this only give an advantage when using specialized applications that are optimized for