overclock 104 gh/s system

[marcosrei]

I buyed a 104 gh/s system in here http://www.sinosigma-europe.com/index.php?route=product/product&product_id=54 now i want to overclock it, does anyone nows howto do it and what is the safe "overclock" i can do? i now some people say this system can run a 114 gh/s with no problem.

I'am asking this because the store doesn't recomend me to it.

Tks.

Marcos