Hi everyone. I'm doing my first build & found that the M5A78L-M LX is quite a good board for FX 6300. The problem is, when I read the MB's specifications on asus.com it says the mobo support 1066, 1333, 1600 (O.C.) & 1866 (O.C.). Since I'm aiming for 1866, I feel that knowing why the later two options are different from the first two is important. My guess is that Asus is referring to overclocking, but I don't know the details of what to o.c.? The RAM or the mobo itself?? Or is there an "O.C. mode" of the mobo that allows 1866 when activated??? Or it automatically switches to 1866 when it detects the appropriate CPU & RAM???? I couldn't find the answer even after searching through Asus' manual, so you guys having been using Asus all the time, pls help me out of this confusion