Overclocking A Gigabyte GTX 670 OC?

[craftspells]

Would it be possible to overclock a card that has already been overclocked in the factory? Will there be any damage if I try? Thanks

 

[Kpssandhu]

Would it be possible to overclock a card that has already been overclocked in the factory? Will there be any damage if I try? Thanks

I have same question, I have gigabyte 670 oc 3xwindforce, But I removed heatsink and add EK Full cover water block. Please tell me how to overclock this card and which software should be used. I have MSI Afterburner.