Hi there, so the new motherboard i plan on buying, an Asus P8Z68-M PRO has some ram options that's kind of confusing me. There are different RAM speeds, from 1066 MHz to 2200 MHz and i would like to know whats the big difference... Is the higher one (the 2200) faster or something? And it also says 2200 Mhz(O.C.) does that mean it can be overclocked or something? Its a bit confusing :$