Did I read the above correctly The last card was not fully enabled?
They sold a card deliberately hobbled for around 1000 quid and folk bought it?
The 1080 was not fully enabled. The 1070 is like the 1080, but even less enabled. Thats a common thing. Its cheaper to make one high-end model and disable stuff for lower cards, than go out of your way to design two separate cheaper and slower versions.