My old mobo has died GA-EP43T-UD3L and I'm thinking of replace it with Asus P5G41T-M LX, it's cheap and seems to fit what I need. Bit of a silly question but I noticed it said DDR3 1333(O.C.)/1066/800. I have 1333Mhz memory, why does it say (O.C)? is it only overclocked memory of that speed will work? my default speed of 1333mhz wont work? Thanks.