Tom's Hardware Guide published a review on Nvidia GeForce GTX 1070 Graphics Card Roundup
A quote from the article:
While we're starting off with just four boards, this roundup will continue to grow as more GeForce GTX 1070 graphics cards arrive at our lab in Germany. Nvidia's GeForce GTX 1080 is the company's gaming flagship right now (check out our Nvidia GeForce GTX 1080 Graphics Card Roundup for in-depth analysis of the top models). But its GeForce GTX 1070 is undoubtedly a better value play. After all, the GP104-powered card outperforms the old GeForce GTX 980 Ti for hundreds of dollars less.Nvidia GeForce GTX 1070 Graphics Card Roundup @ Toms Hardware
There's a lot of variation out there, though. You'll find 1070s selling anywhere from under $400 to over $500, and it's amazing to see what Nvidia's add-in board partners have done with this platform. To help you size up the current field, our team continues testing GeForce GTX 1070 cards. For now, we have four different models to compare. And we go deep. Really, each page of this piece could be its own complete review. We focus on the manufacturing quality and technical features of each card, along with power consumption, clock rates, cooling, and acoustics.