That Nvidia will release a GPU that is 100% faster than 1070 for 330 USD (which is you price in the comparison) is quite unrealistic
This generation we had quite a boost, yet the 1060 is only about 12% faster than a 970 as an example.
And dont forget the difference in power consumption! I would love a single FPGA instead of a 1080 ti rig, but have to see that it works first. Lead time in Norway is 12 weeks though

will be 500 at launch( so 15 1170 vs this board will be $4000 vs $7500)as usual and 700 for the 1180 which is arguably as a fast as this fpga board for the same
a 1170 will consume 100 watt, tdp of a 1180 which is a strongest card is the same as 1070ti which consume only 100, so a 1170 will consume less probably at lower tdp