You need to overclock each part seperately...
First lower your ram speed, then overlock the cpu.
Lower your cpu multi, then overclock the ram.
then overclock your graphics card, and put all 3 together.
I usually use bios setting because you may need to increase voltage. I prefer to do this at start up and not stress the hardware by using software to tweak, although I have done both.
Software is easier to test your limits with, your asus bios is easier to push the limits and create a more stable system.
each part will have its limit. Push the cpu til it becomes unstable, then increase the voltage 1 step. re-test. dont volt too high. I usually go up 1 step only in voltage, I want my cpu to last.
You can then see which performs the best together with benchmarks and what you need.
I usually increase my core, then overclock the ram to its limit. Then use software to overclock my graphics card, and you're ready for gaming. Make sure you leave the fans turned up BEFORE overclocking.
Thumbs Down Eric J for saying stupid **** likes hes a pro.. I dont care how old you are, give some suggestions or stfu "pro"