I still don't believe the 1070 will be faster than a 980ti, maybe an overclocked 1070 will equal a stock 980ti at 1080p.
I would say the resale value of the 980ti depends on how close the 1070 is in performance, the 1080 will obviously be faster but also is in a different bracket.
The 1070 has 25% less cores than the 1080 and also standard 256 bit GDDR5, so that will be 25% slower than 1080 at least. 1080 at 1860mhz in the 3dmark leak was 8-10% faster than OC 980ti.
why would huan say the 1070 is faster than the TitanX then ? my guess if it's not slightly better it should trade blows with it, and he cannot be talking about OC 1070, that would be straight out lies not even PR spin, and also 1070 should be roughly 20% slower than the 1080, assuming 5% loss of cores effciency and driver work.
so if you put it 10% under the 980Ti that means the 1080 is only 10% over the 980Ti, that would make pascal a complete utter failure.