(I wonder if this is where IGN got the 4x the power of the 360)
Ok, so if Nintendo is shooting for a gpu that can handle 1600p, they have plenty of room to handle a couple upads by only having to output max 1080p for a current gen game. I find it very telling that the original rumors of the WiiU had 4 pads working with the system, not one.
At any rate, I expect the WiiU to handle top tier current gen games @ 1080p with one, possibly 2 controllers, without problem. This should be case for the majority of the games for the next two to three years. Once the new consoles of MS and Sony come in, developers might be forced to drop the WiiU games down to 720p unless... the WiiU has become the defacto console to develop for.
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This is likely what is going to happen, setting power levels aside, it is the first console of next generation that will share all the same effects you'll see in the other consoles coming in ~2013/2014.
I don't think you should look at the console being able to output 1600p, yes originally I thought it would be easiest for Nintendo to just display 2 1080p imagines (roughly 1600p) but the problem is actually possibly in the wireless technology they are using, it might not handle that sort of bandwidth because of latency issues.
2upads seem to make the most sense, it would allow for 6 player party games, and also much more importantly very unique head to head games and co op games. The power level of the Wii U at launch, I would peg around where you are estimating, but it could only be 2 or 3 times the power of the 360.
Please stop with this useless power debate.
If Nintendo was releasing specs, this debate would reach levels that rip interdimendional holes into our dimention, summoning cuthulu on a skateboard, whos rapping the frash prince theme while annihilating all of us with killer bananas from outer space...
So seriously... stop
You have to understand, there are people worried about the system that are not trolls, they just want to find value in the Wii U, my basic idea here is to point them to the bird and zelda demo being displayed twice, and being beyond 360's capabilities, that should indicate roughly twice the power in early dev kits, and ending up somewhere below 4 times the power.
There is stuff that makes it hard to say though, basically even if the GPU is 4times the power or more than a 360, the CPU isn't going to be, wsippel just found out something official that points to the cpu being comparable. There are many many factors that come into how powerful the Wii U will be, but the answer can only reasonably be more, with something like displaying twice the pixels of the 360 with the same effects as in the realm of possibilities, that shouldn't really scare anyone, but it likely does because everyone expects PS4 and Xbox3 to be alienware Desktop PCs from 2015.