Please don't get offended, but I just have to say this:

Do not ask if it is safe or not! Just read the thread! OK, that's too much, but perhaps somewhere after page 80 or so. There are plenty of answers already there, and this thread is as bloated as it can be!

I know that overclocking pretty much equals speed, and speed is what everybody wants, but the answers are already there, save the long-term real life effects of the overclocking.

Apologies, and carry on.