I plan on buying a new laptop and the 2.5 GHz is hard to find in the new ones.  I'm seeing 1.8 GHz with up to 4 GHz with 4 cores.  Hesitant to buy because of the 1.8GHz but sales people tell me because it has 4 cores it can handle data equal to a 2.5 GHz dual core.  I'm not tech savvy so want to make sure I'm okay with this laptop.