There is no difference except that one card is made by asus and the other by ati. I would go with the ati card. Asus always makes the most expensive cards I dont know why though.
I think that maybe the pricing isn't updated yet for the asus one.
they are usually cheaper because of the supposed higher standart of quality control and more software included, but the price difference should be round 20$-50$ max, not a couple hundred.
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