The reason we have that amount of horsepower at that price point is because we also have a $649 card at the top end and drive the technology down in to the lower product segments. We have spent over 1 billion dollars in R&D over the last 3 years to make that happen--the benefit of which goes squarely to the gamer---the consumer. Because of that investment, we have a whole line up of fantastic products at every price point.
Never before has the gamer been in such a fantastic position GPU-wise. 6600 DDR2, 6800 GS, 7800 GT, 7800 GTX or 7800 GTX512.....those are all great options from $100 up to the high-end.
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Source: Penstarsys