Oh, i have lost hope in the world...you guys if u have 4x2.5 ghz its 2.5 ghz. having more cores is for multitasking and having many different programs open or running high demand applications on several cores. Look at it this way, 4 runners can all run 5:30 min miles, just because there is more runners does not make them all faster, however if you devote all of the cores to one application, lets say a high demand game, it will run smoother than on just one core. You could also look at it like hauling goods in a pickup truck vs. a semi both going at 70 mph same speed, more payload.