On paper, at least, these products appear very attractive, especially the one at the top-of-the-range that would reach Teraflop, while consuming "only" 150W and costing 349$, which is not so expensive for a top-of-the-range card that is equipped with 1 GB of GDDR5.
it remains only to hope than we can use these cards in our Mac before they are exceeded by something even better.
