I am buying new motherboard and it says this 2933(O.C.)/2800(O.C.)/2666(O.C.)/2600(O.C.)/2400(O.C.)/2200(O.C.)/2133(O.C.)/2000(O.C.)/1866(O.C.)/1600/1333MHz , i know oc means overclocking but i dont know what it has to do with ram. I am planning on getting 1866 2x4GB