my gnote2 is bigger than your puny iPhone.
The ouya has a tegra 3 at 1.3ghz. The Shield has a 1.9ghz tegra 4. Significantly more power.
The shield running stock android means it doesnt need to stream from a desktop PC. With the OUYA also being android based I reckon it would be a fairly easy port to get an OUYA game running on the shield, either with a port of the game code to the shield or possibly a modded OUYA SDK. Dependant on how much source code is available for the Shield roms and OUYA roms it might be possible to run an ouya rom on the shield.
Windows 8 wont run on a tegra 4. Namely because windows 8 is x86 only and tegra 4 is ARM.
Windows RT might but there have been no new windows RT devices announced so none with a tegra 4.
Only tegra 4 devices I know of right now are the shield, the HP splitbook x2 and the NVidia demo phone and demo tablets sold to manufacturers to sample what the tegra 4 and 4i can do.
I could see myself getting one of these. Not at launch but after a couple critical mass games and the one that gets more quality support for console like gaming. The ouya is potentially a GameCube successor and the shield has a lot of potential but are people really going to put their smart phones and tablets down for a dedicated but still portable console.
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While I was previously interested in the OUYA for some hard core android gaming on a tv, I've kind of lost interest due to the fact that its model was meant to attract developers looking to make a name for themselves meaning small scale AA games. While there's nothing wrong with producing opportunity for new developers, it does mean that a good portion of the content will not be worth your time atleast in its early stages. The Nvidia Shield not only has the power to handle anythjng the market can pushout for atleast the next two years, the OUYA is packing hardware which is already outdated.
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