actual Xilinx datasheet:
http://www.dinigroup.com/~mdini/Bitcoin_mhash_FPGA_guide_v1402.pdfAs you can see, the amount of gates is usually a good gauge of the hashrate... This comparison chart is from an Engineer Group that builds extremely powerful dev. boards and they have PERSONALLY validated the potential hashrates for these chips if properly implemented.
Good gauge to the hash rate? 7V200T, obviously the fastest chip in their fpga portfolio: 5296 MH. That equals to 5.296GH!
You just think you found a crystal hidden gem in the bitcoin world and think you can start selling fpga chips now?
The fpga race is long gone over. Now there's something called ASIC! Google it, i'm sure you'll find chips in stock that you can trade..