Overclockers Club published a review on the NVIDIA GeForce GTX 1070 Founders Edition
A quote from the article:
What we see with the GTX 1070 Founders Edition is that NVIDIA's tried and true method of scaling the architecture up and down to meet performance targets is once again working quite nicely. The introduction of NVIDIA's Pascal architecture built on a 16nm FinFET process has added the FPS performance needed to allow end users to take that big leap up the hardware ladder to the next level of performance. At NVIDIA's Pascal launch event, a slide that caught everyone was that the GTX 1070 was going to be as fast as the top card in the Maxwell product stack, the GTX Titan X. Truth be told, that target was reached and exceeded in many cases in my testing. From 1920 x 1080 through 3840 x 2160, the GTX 1070 was every bit the equal of the GTX Titan X, and in many cases it was the faster card.NVIDIA GeForce GTX 1070 Founders Edition Review @ OCC