i dont now how, you gave 400e for one card...rig (6 card) cost 2400e+motherrboard,psu...500e that is 2900euro.
eth is 160eura, if you get lucky, you have speed(now) 170MH/s and you mined for month 1.5ETH that is 240EURO for month and fee...eth to bitcoin...bla bla that is 200e max max....
That mean 14 month to get back money...that case is now for 4 month situation will be more bad (120-150euro max) dag file growing, speed get slower(MH/s)...
tell where I`m wrong....