If it works, your not going to damamge your ram, so keep it that way.
I am guessing you have a really cheap motherboard as well, not autodetecting the right settings and you should have a seperate thing to change your ram ratio's
ok..i just ran Doom3, and it just cut out and went to a black screen witihin 30 secs - 1 min on playing it. It stayed on a blank screen until i rebooted. Is this due to the overclocking? As this never happened before.