It's hard to gauge the Tegra X1 chip because as something that's only in Nvidia's Shield Console basically it has very little software support and no team was going to build a game specifically for it, the Shield's install base makes the Wii U look like the PS4. It's quite likely developers coding to the metal of the unit and actually putting effort into it could get a ton more out of it (look at what Vita devs have pushed a chip 1/14th of a Tegra X1 to).
But Doom 3 BFG Edition on the X1 is one example of a port from PS3/360 that runs at full 1080P 60fps while the PS3/360 struggle to run the same game at 720p (PS3 version drops below 720p many times actually). So when programmed well for it can run 1080P 60 fps games even, just PS3/360 quality, but that is not an insignificant bump.
To me this whole NX concept hinges on execution from now. Nintendo can either be sloppy with the execution or they can take this concept and execute it very tightly but would say is:
There must be TWO performance modes for NX IMO. If this is truly a portable console and not just a portable with a TV out, then it should have different performance modes. The needs to display on a 6-inch screen are very different from a 55-inch HDTV display.
You don't need even 720p for portable mode. Even 960x540 or 1024x600 as a display target for play on the go is plenty.
But the home games should be able to run at full 1080p IMO. It needs to be a tangible leap beyond the Wii U when playing at home.
The home mode performance should be in the range of 1 TFLOP while the portable being 400 GFLOPS or so. If they can pull that off, however they do it (docked mode, a dock with extra processing power, all the power in the chip which downclocks in portable mode then is cooled by the dock for full power, etc. etc.) then this concept will work pretty well for them.
If they are just farting out a portable that can render OK on a 6-inch sub-720p display but thinking that signal mirrored to a TV is good enough for it to function as a "home console" too ... that is incredibly lazy and the system won't be seen as a viable TV console IMO.







