To KHUBBU:
O/c'ability of a GFx card mostly depends on its build quality-this includes its core components and its cooling setup.Since you too agree that BIG cards are not having good build quality,in fact they have poorest quality among the current card vendors.BIG cards tend to show unstability after O/c and tend to run hotter.Also their performance boost after o/c'ing is not very significant.As for XFX,even a passively cooloed 6600 non GT from XFX overclocks like a dream and runs cool and rock stable.
As FEAR includes heavy in-scene lighting effects,it stress all 6600s,which are not clocked high enough.But overclocking helps a lot! I do not suggest BFG because of their non-availibility.So, if you get hold of one donot get it because,NO SUPPORT vailable for 'em.
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