peakme :
What's the risk could happen? Will it kill the RAM?
No one can answer that with 100% certainty. I have done it many times and jthe worse it happened was system unstability, which goes away by undoing the changes.
Any OC requires that you run components outside recommended specs.
If you are doing it for the experience then is fine but you won't notice any performance gains (1-2% maybe)
If that is not worth your time, then don't take any chances.