I'm targeting 3 parallel cores running at 200 MHz each for a hash rate of 600 MH/sec. The power is phenomenal in the .9V low power part, only 5.2 watts, giving a figure of merit well over 100 MHashes/watt.
Interesting! Perhaps Artix boards will have a better $/MHash ratio? Any good synthesis runs you could share with us?
I see that mpfrank has rolled his own pipelined VHDL...
I reposted your request in mpfrank's thread