Does anyone know what the cost of these 28nm Artix 7 chips are?  I've been looking through and the XC7A350T looks promising with 350k LUs. From the text on the site it looks like they're using this chip to replace the Spartan 6's.

The idea of being able to slap 8+ of those chips on a 1x PCI-E board appeals to me. From my figures the code should be able to be unrolled 3-4 times per chip giving a theoretical processing power of 1ghash/s per chip. Since the spartan 6 is running at about 66% efficiency compared to it's theoretical values. I figure the XC7A350T current real world values would be around 600mhash/s per chip.

I sent an email query off asking for pricing information but have not heard back yet.