ben001 :
thnx..& some people told me dont go for factory OC cardz , they might cuz a problem if u want that card to be overclock again in future...its better buy to the base clock cards & overclock it just like the msi,asus & gigabyte.... Is it true?
That is kind of misleading as well because there is no way of telling if the stock card can overclock better than the OC editions. GPU chips can perform very differently and there's no way of telling, which ones will be better for overclocking. The manufactor picks out some chips that has good head room for overclocking but that doesn't mean you can't get lucky and get a stock version that can overclock better than the one overclocked from the manufactor.
Personally I wouldn't buy an AMD card that is overclocked from the manufactor because AMD chips overclocks really well in general, while Nvidia chips can be a bit more difficult to overclock.
So if you are buying a Nvidia card I would pick up a OC edition if the price is fair. It's true that a OC'ed card may be more unstable but it shouldn't be the case when the OC comes from the factory.