when buying ram and a motherboard if i buy a motherboard with a 1333 bus speed and i buy ram that is ddr2 800 pc6400 and overclock it to say 1066 i assume thats like having actual 1066 memory for less money but would it be better to just buy a higher rated memory from the start if price isnt to high? also if i have a 1333 bus how can i use that to its fullest potential without going ddr3? will the 1333 bus be of any use with ddr2 800 pc6400 or other ram? how does the extra bus speed benefit me for overclocking?