WTF do you want to overclock you memory?
People are selling PC-150 memory now, and thats faster then any sane system can run it.
Look at my sig. that memory runs 140Mhz 2,2,2 with all three banks full. Stable, and fast, only $90 a stick too.
Why risk overclocking your memory, when you can just go out and buy some that is faster, and it's not anymore expensive?