klipschkiller :
If the GTX 1070 ti has the base clock of GTX 1080, same type of vram and boost of 1070, then what is the point of the releasing the card? A Evga ICX, MSI Gaming series, Asus strix series, etc. 1070 caught on sale overclock to near identical specs, base and boost speed is a better bargain, or spending seventy or hundred more dollars GTX 1080 with faster vram, bandwidth, no disabled specs, and more overclocking headroom is still a better bargain.
A 1070 Ti has 27% more shader cores than a 1070, you'd need a pretty huge OC on a 1070 to make up for that.
The 1080 only has 5% more cores than a 1070 Ti. And I'm not sure what makes you think a 1080 will overclock better. The only significant advantage of the 1080 is VRAM bandwidth. I seem to remember seeing some evidence that Geforce 10 chips aren't particularly memory bound (which would mean this isn't a major drawback), but I'm not sure.
Edit: Huh, only just noticed that GTX 1070s (and now the 1070 Ti) still use 8 Gbps memory, and never got the memory speed upgrade like 1060s and 1080s did. I had just assumed they would have.