because if you overclock your cpu too high you raise your ram frequency too high if you do not properly set the divider
example using say, ddr2800 (which actually is 400mhz freq):
fsb = 290x11 = 3190ghz
ddr2 800 divider (for my amd) is 6.
so, 3190/6 = 531 mhz and that probably aint gonna happen w/out mad skills.
fsb = 290x11 =3190ghz
ddr2 667 divider (for my amd) is 7.
so, 3190/7 = 455 mhz totally posible with good ddr2 800.
in other words, dont mess with your ram until you have your cpu maxed and know a little more about the process, it will save you a lot of headaches.
free lesson lol
"nagasama no longer drinks tecate, or streaks out of the night for anything, and he has a fine wife so he has no use for your girlfriend...she is safe..."