i bought some of those http://www.dualminer.com/iBeLink-DM384M-Dash-and-X11-Miner_p_36.html and right after the diffrate goes way up! at the begining i had some unbelivable 160$ a day, now its 6$ ! So it doesnt make any sence to buy these X11 miners now. X13 or X15 maybe....