Have seen the Asus P106-100 cards and they are basically these cards with 6gb on the pcb but made for mining only as they don't have any dvi or vga output in the back of the card.
I know that msi makes their own variation of this card as well.
They have been sold out for months now as with any of these cards now.
Unless they come at a big discount they won't really be worth it, the resale value of them is practically 0 since they are useless for anything else.
I have been getting my Zotac AMP! 1060 with Micron to 23.6 on Ethash with +700 on mem, -20 on core and the fan running at 50% fan (65-68°) at 80% power limit, seemed to be the lowest power drain (between 66 and 75 according to GPUZ, no idea why it fluctuates so much)