help a newb plzzzzz....

[tjpark1111]

i pretty much get everything in the overclocking thing, but there is still one thing I don't get. I went to gogar's OC optimizer for Athlon 64 and one of the bolded values for the memory I don't get. It says 5:6(i get that) 166(i get that too), then DDR333. What does the DDR333 actually mean(or rather, does it factor into calculating the memory speed), because the actual memory speed I get with those values above is DDR489..... I'm really confused, help. Also, is 5:6 and 166 just 2 different ways to state the mem divider? or are they not the same? In the mobo bios, do the options for the mem divider state in the ratio way(5:6), or the number way(166)? Because if it's in the ratio way, I probably will take a way longer time calculating all the choices of ratios that the mobo gives me.