My shiny new EVGA GTX 1070 Founders edition arrived yesterday so I thought id give a few thoughts here, for those who might be looking to upgrade 
Well, first impressions, it blows my old GTX970 out of the water, so off to a good start. First thing I tested it with was trusty old Unigine Valley benchmark (extremeHD preset) for a direct comparison to my 970, scores below:
Below are a couple of screen grabs from GPU-Z and Afterburner showing the core clock/memory clock and temps while playing Elite, core clock hovers around 2000MHz, temp never exceeds 61 degrees...
Ive done a bunch of framerate comparisons, using the most graphics intensive areas in game (in stations, in large surface base) as well as a basic "in space" one. For the comparisons all settings were maxed out, SMAA antialiasing and 16x anisotropic filtering forced via control panel. Each test was done at two settings one at native 4k (3840x2160) and one at 4k with 0.75x supersampling (essentially rendering at 2880x1620 and upscaling to 4k). Quick spoiler, this is not a 4k card, while its pretty playable at 4k (native) you will often see dips to 45-50fps in stations etc, which for me is unplayable, id rather sacrifice resolution to get a locked 60.
Anyway screenies and results below...
Basic "in space" test:
4k native
4k at 0.75x
In dock:
4k native;
4k at 0.75x
Docked at large surface port:
4k native:
4k at 0.75x
In conclusion, well its an awesome card, not quite a 4k card (I didn't expect it to be). But certainly a beast at 1440p for most games, and with Elite you can push it a bit higher, in my case 4k at 0.75x (2880x1620) results in locked 60 no matter what. I could probably push it up to 4k at 0.85x (3264x1836) but that may on very rare occasions drop below 60fps, so I'm sticking to max settings, 4k at 0.75 as the sweetspot settings for my rig.
On a sidenote, if you're wondering why I'm choosing to run at 4k and downsample, rather than run at lower resolutions and upsample/supersample. Its because I game on a 4k tv, which has some odd resolution support, for instance, it supports 1440p but only at 30Hz, while it supports 2160p (4k) at a full 60Hz. The odd resolutions like 2880x1620 aren't supported by the tv at all, so for me personally its better to run at full 4k and use supersampling to drop the internal rendering resolution to something that guarantees 60fps.
*Edit* For those interested in VR, the best I can do by way of a VR benchmark is the steamVR benchmarking tool, screenshot below:
Well, first impressions, it blows my old GTX970 out of the water, so off to a good start. First thing I tested it with was trusty old Unigine Valley benchmark (extremeHD preset) for a direct comparison to my 970, scores below:
GTX 970: 2470 (fps avg. 59)
GTX 1070: 4003 (fps avg. 95.7)
GTX 1070: 4003 (fps avg. 95.7)
Below are a couple of screen grabs from GPU-Z and Afterburner showing the core clock/memory clock and temps while playing Elite, core clock hovers around 2000MHz, temp never exceeds 61 degrees...


Ive done a bunch of framerate comparisons, using the most graphics intensive areas in game (in stations, in large surface base) as well as a basic "in space" one. For the comparisons all settings were maxed out, SMAA antialiasing and 16x anisotropic filtering forced via control panel. Each test was done at two settings one at native 4k (3840x2160) and one at 4k with 0.75x supersampling (essentially rendering at 2880x1620 and upscaling to 4k). Quick spoiler, this is not a 4k card, while its pretty playable at 4k (native) you will often see dips to 45-50fps in stations etc, which for me is unplayable, id rather sacrifice resolution to get a locked 60.
Anyway screenies and results below...
Basic "in space" test:
4k native

4k at 0.75x

In dock:
4k native;

4k at 0.75x

Docked at large surface port:
4k native:

4k at 0.75x

In conclusion, well its an awesome card, not quite a 4k card (I didn't expect it to be). But certainly a beast at 1440p for most games, and with Elite you can push it a bit higher, in my case 4k at 0.75x (2880x1620) results in locked 60 no matter what. I could probably push it up to 4k at 0.85x (3264x1836) but that may on very rare occasions drop below 60fps, so I'm sticking to max settings, 4k at 0.75 as the sweetspot settings for my rig.
On a sidenote, if you're wondering why I'm choosing to run at 4k and downsample, rather than run at lower resolutions and upsample/supersample. Its because I game on a 4k tv, which has some odd resolution support, for instance, it supports 1440p but only at 30Hz, while it supports 2160p (4k) at a full 60Hz. The odd resolutions like 2880x1620 aren't supported by the tv at all, so for me personally its better to run at full 4k and use supersampling to drop the internal rendering resolution to something that guarantees 60fps.
*Edit* For those interested in VR, the best I can do by way of a VR benchmark is the steamVR benchmarking tool, screenshot below:

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