@nine3o
Uh, if the memory is bad every OS will crash, including OS X.
Regarding overclocking: If your OC makes the system unstable "you're doing it wrong"(TM) and you should probably run your system at stock speed. Hint: You typically need to lower the FSB vs Memory ratio when raising the FSB (unless of course the rig supports insanely high memory clock and the memory chips are rated for the higher clock).