I'm doing research.
I have an FPGA XUPV5-LX110T that seems to be pushing about 400MH/s, that is double the current record.
Current consumption is about 3A at 3V3 which is about 10w , but even so it still blew out a component bottom right.
and half way up the right a solder blob to patch the inductor that blew out....
The current seems too low for the hash rate, but chipscope seems to confirm it....
I just finished debugging the "hacked" board today.. and yes I know there is no 'coin' in using an FPGA to mine, but I have my eye on litecoin.....
Yellow glue & bluetack is great for sticking development hacks on a PCB