When I was trying to get a figure how to build simple and cheap machine for bruteforcing I used 4x 7970s 100 dollars each, 1000Glops Doubleprecision each. Single 7979 is capable of 10k password attempts on locked ZIP file, and when i knew it was password with 12 digits, it broke it in 1 minute.
6000gflops in Double Precision would do that in 10 seconds, 4 cards will do that in 2.5...
It would be way to cheap to have that kind of bruteforce sold to random customers in hundrets of cards...
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