Nice, and many thanks for the release.
Now, some rough calculations.
At 80 MHps, I will need at least 3 of these to achieve a single 5830 hashrate.
That is $595.-x 3 = $1785.- at full price, vs. $190.- for the 5830.
Giving the 5830 is consuming $11.- a month in electricity, and assuming this board will consume zero electricity, it will take more than 145 months, or 12 years to recover the investment, always comparing to a 5830.
Is it really cost feasible ?
You answered your own question. But don't hate. It's open source being released, others can improve on it. No telling where it could lead.
Sure, I would like that improvement too. Numbers made only to show that "fpga is taking over btc" not possible at this moment.