After I read a overclocking guide in that site.
I've found a big flaw in my overclock plan.
"For long term stability, IE computers that are going to be running for more than 2 years or so with a load most of the time, overclocking is not a good idea.Also, there is the possibility that overclocking will corrupt data."
Its big problem since I'm going to use this to render my 3D work and keep it in my computer,and I turn my PC on almost all time.Ahh I think my plan to overclocking is totally failed after all lol.