No I am refering to the X1.  Sure it's compute is nearly 1/3rd, but its bandwidth is 3/4+ that of the X1.  People keep forgetting that bandwidth is half of the equation - it's what feeds the cores.  The X1 is bandwidth-starved, and that is one of the main reasons it struggles to run so many games.

Well the iPad Pro is 2-3x stronger than last gen, and about half as strong as X1.  So yes anything on X1 in 900p should run on the iPad in 540-720p just fine!  Would be an amazing and game changing development honestly.

It won't be, largely because Apple isn't going to license this chip out and will keep it for themselves.

The other reason is because no one wants a melting handheld with a half hour of battery life when put under any moderate load; the NX handheld will have a considerably smaller screen than the iPad Pro as such also doesn't need this sort of throughput, Nintendo will go for something efficient and proven but capable of easily outperforming the Vita at ~540 in 15:9.

The chip isn't that special, Nvidia has a rough equivalent to it, AMD likely could give Nintendo something similar, perhaps even better because Nintendo could fine tune the design specificly for gaming. The Apple chips are just PowerVR processors though, that's why Sony was able to get more or less the sam exact chip in the Vita as the iPad 3. A9X is just a big, big, big, big brother version of the Vita chip. 

As for battery, I'm guesstimating a 32 wH battery ... so a large battery, but it could fit in a tablet form factor (iPad Pro has a 38 wH battery). 

If it was running a 9 watts/hour ... you'd get 3 1/2 hours battery life assuming the game is pushing the system to peak performance and the screen is at a high brightness with WiFi on ... that's more or less the same as a Vita or current 3DS. 

Could they keep it passively cool running at that for 3+ hours ... that I'm not sure. But I'm guessing this iPad Pro is consuming at least 6 watts when you're doing things like running games or editing 4K videos at minimum. 

If Nintendo could run PS4-style engines at 540p resolution (approx 450 GFLOPS processor + 50GB/sec memory bandwidth) ... then it would scale very cleanly with a console "big brother" that could run the same games at 1080p (4x the pixels). 

The NXDS won't be that powerful if it means Nintendo would have to ditch their dual screen to do it.

I think the NXDS will be plenty powerful, still have dual screens, still have the clamshell, still have the 3D, and have the top screen have a clean 720p resolution to boot. All for $200-$250.

But I've already made an entire prediction thread about it. But a tablet handheld successor to the 3DS is 100% never happening.

To be precise (Apple info) A9X is 1.8x CPU and 2x GPU of A8X (which is in Air 2). Half of XOne is bit too optimistic, more like 1/3 (XOne GPU doesn't really have memory bandwidth problem once devs have learned around ESRAM) - which is still fine for 720p with lower settings.

1/4 then (540p) should be more than feasible then right?

Maybe XB1 fidelity at 540p with maybe some effects scaled back, and higher end Wii U-esque engines at 720p/60 fps fairly comfortably. 

Play Dragon Quest XI, Kingdom Hearts III, Resident Evil 7 at home on the console, take it with you on the go ... yeah if they could pull that off, that'd be something. 

so which one more powerful, Nvidia Tegra X1 or Apple A9X, i am planing to buy Nvidia shield tablet, but i want to see which one is good on real gaming benchmark. I bet Tegra is the best one considered Nvidia is good on driver and optimization, and also is special build for 3D and gaming.

Today lotsa mobile CPUs outperforms Wii U CPU. So nothing strange here.

A9 processor destroys the competition with only 2 cores. It outperforms the unmatched A8X processor too, which is used on a tablet with a 6,000mAh battery. A9 is using a 1715mAh battery to power through the day with Siri "always-on-always-listening". Reviews state the battery life of the new iPhone is unaffected by any of that. To put it midly, A9 power efficiency is remarkable!

Mobile chips is one of the most exciting technologies to follow these days.