I dunno about the GDDR5 part, I think that's where it gets complicated and you'd have devs struggling with 2 different memory architectures. 

What they could do is use a 128-bit bus like Apple does on the iPad Pro for 50GB/sec + main RAM bandwidth. Then you could have a pool of eDRAM on the GPU which Nintendo loves that is higher speed. 

If you had two Tegra X2s working in unison I suppose you'd have two eDRAM pools to work with too, which might be interesting. 

That should be enough to get you XBox One type performance, probably better in ways. 

Even the Tegra X1, might not be that impressive, but if you put two of them together in a box and added high bandwidth eDRAM into the mix ... that's a fuck-ton of power in a little package. 

I guess the SCD chip could have more eDRAM on it since it would have more breathing room. 32MB eDRAM on the SCD + 16MB eDRAM on main NX chip ... not bad? 

Lets say octa-core CPU ... quad-core ARM A72 + quad-core ARM A53. Tegra X2 GPU, which is lets say 30-40% better performance over the Tegra X1. 50GB/sec main memory bandwidth (6GB LPDDR4 RAM at 50GB/sec on 128-bit bus). 

Not only the price of the 3DS is way higher than it's producing costs (think of the 2DS which is sold for 75$ in bundle and with a gain for Nintendo) but you have to think that some of the 3DS components are getting so old that they require more money to be manufactured than more advanced ones, in the end the portable NX doesn't need to be much more powerful than the Vita imho...

The portable needs to be able to run the same games as the "console mode" or "console version" or whatever you want to say. Sure there can be compromises in screen resolution, frame rate, and even shadows/textures/lighting/detail but it can't be essentially an entirely different build of the game. It needs to be like "low/medium" settings on a PC versus high settings in docked mode. 

Vita performance is no where near close to that, Vita is laughably outdated, there's tons of chips today that run circles around that, no reason to aim so low for portable play. 

Portable mode is really the key to the NX, it can't just be some afterthought as in "just shit together anything for the portable version of the game", that's not going to work. 

25GB/s+ seems to be the general hardware consensus of acceptable 720P gaming.
However, that's just a raw number... We need to take into account nVidia's tiled based approach and various compression techniques, the real-world bandwidth is likely to be much larger than that.

I know. But it's what I want. I really don't have room/time for displays that are only 1080P and under.
I have been gaming at 1440P on the PC for years and years, it's hard to go back to anything less.

128bit LPDDR4+L3 is better than 128bit LPDDR4+eDRAM IMHO.

eDRAM can basically end up being a slower, larger capacity L3 anyway. (Hence why it's used as an L4 on some chips.)

The main reason Apple likely removed it was probably due to costs and to keep power consumption down low, transisters cost money and power.

I have a 7" Android Gamepad/Tablet thing, it's a good size.
If you go to big, then you start to impact on it's mobility... Which then compromises a massive aspect of the device.

It's not as simple as that unfortunately.
Things change depending on the chip, how many TMU's, ROP's, Memory Bandwidth, Polymorph/Geometry engines, Cache sizes etc'.

And of course, the task at hand. There are some compute-only tasks (Aka. Floating point/Flop) that simply fly under AMD's hardware, yet falter on nVidia's and the reverse also holds true.

I think the idea people have that AMD's flops are worst is because people associate it with a certain level of gaming performance, when it's not to be used in that fashion anyway.

Take the Radeon 265 at 1.8Tflop. (Aka. Slightly higher clocked Radeon 7850.)
Yet it's faster than the Radeon 6950 at 2.25Tflop.
And faster than the Radeon 5870 at 2.7 Tflop.

The main reason why the 1060 pulls ahead is because of it's tiled based apparoach.

I doubt they would use different memory whilst docked, there are a few caveats in doing so.

I think you are missing the point entirely.
Even if Tegra was 2 Teraflops verses the Xbox One 1.3 Teraflops... It would still be slower.

Besides, the Xbox One's graphics quality isn't exactly setting people's worlds on fire... And it's about to be superceded by something even better.

The CPU will be two nVidia Denver cores backed up with Quad ARM A57 in a Big.Little configuration if they go with the Tegra "X2".
Otherwise expect 4x A57 + 4x A53 also in a Big.little configuration if they go with the Tegra X1 chip.

And I am strongly betting the memory will be 4 or 8Gb on a 64bit bus, it makes infinitely more sense.

Thanks for posting this information. It was fun to read about.

I think this is basically going to be the size of the Wii U tablet basically, maybe shave a bit off the bezels and make it thinner/sleeker, but even at that size with a depth of 0.75 inches lets (this about the same as a Vita) ... the internal volume is huge, it would be bigger than an Apple iPad Pro in volume because it's 3x the thickness almost.

It needs to have some thickness to it anyway because gaming on a device with physical controls as thin as an iPad (0.27 inches) won't work well at all. 

That should be enough to get a monster battery and still have enough open room for cooling.

The idea will be not that this is a pocket device, but that it's a portable table-top console that encourages people to gather around and play and if its for one player then the hook is that its better than a tablet at dedicated gaming.

But I see this at airports like a million times over, families with young kids gathered around a tablet playing. I think Nintendo has studied carefully how kids use tablets too. It will probably have a built-in kick stand like the Microsoft Surface line of tablets too. 

Let's hope it's a massive success at any rate. As competition is a wonderful thing and I would dislike for any company not to do well and fold up shop.

Everyone knows that Wii U has 32 MB of edram, right?

I asked my mother and a stranger on the street. They both didn't know that*. So it is a fact, that not everyone knows that Wii U has 32 MB of edram.

* They also didn't know what edram is. Or what a Wii U is. ;)

lol.

My comment was to earlier remarks that Nintendo might include 24 megs in the NX.  If they go the edram route, I would think they would excede the 32 in the U.  A better option might just be a larger amount of faster, regular RAM.  Deves seem to like the PS4 setup better.