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There are reports coming out since the Tegra reveal that the Dev kit handheld has a fan. If that makes it into the final design, that will not be good.
Nintendo will need to release the NX very cheap, and have more 'full' games available on release to warrant its place in my home at this stage.
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If Nintendo are going full steam at the Pokemon Go audience, then I see no reason for them to be in the hardware business at all.
Thanks for posting those vids - I tried the Shield TV out and was not at all impressed with it and returned it.
Note that Nintendo may be using the original Tegra (or maybe an in-between the 1 and 2, or a "Tegra NX" special for Nintendo) in the NX mainly to make sure they sell the NX at a profit.
Plus, just because a game didn't port well over to Shield from the 360/PS3 doesn't mean it will be bad on the NX. Just like a console, the developer can optimize the game for the NX as opposed to trying to get the game to run an the myriad of Android platforms.
I think everything should be fine - it is do or die for Nintendo as far as hardware this next one for them or it could be their "Dreamcast"...