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..
The comparison chart was just to give an idea of how to guage hashing power by solving an equation using gates as the main variable. The 7V200T is not the fastest chip that Xilinx offers though... And asic will only let you mine SHA256 coins (btc,trc,ppc,etc...). I also have 300GH worth of asic block erupters so I am familiar. If you think that mining is a race to buy the newest mining asic on batch order, then you are caught in a crucial pyramid scheme....