Both of the cards on show today are the iTurbo models, which means that you have manufacturer-supported overclocking via HIS's iTurbo overclocking utility. Many people are unsure about overclocking, since you can invalidate the warranty or cause damage. The nice thing about the HIS iTurbo models is that the cards are garunteed to hit the advertised overclock with no stability issues - or you can return it for a replacement.



Link: OC Prices