Quick question... the 870 states that it can run DDR3 1800 and 1600. However, it shows the OC (overclock) next to these speeds. Does this mean that if you purchase pc12800 RAM (DDR3 1600) it will not be compatible? Is the only way you can run 1600mhz on this MOBO by overclocking (pc10600) 1333mhz?