Here's the full article
http://www.gonintendo.com/viewstory.php?id=148615
But this section is important to me
Iwata: Choosing 3D led to the need to double the graphics and increase the brightness of the backlight, so there must have been a lot of challenges with regard to power.
Umezu: I knew from the very start that the LCDs would require lots of power, so I thought we couldn't use that much for graphics. I spent quite a lot of time looking into programmable shading, but when you use that method for a handheld game system, you also have software processing in the SoC, and a number of steps become necessary for calculating the shading to render one point on the screen, so it can't keep up if the operating frequency isn't fast enough.
Iwata: In other words, that method eats up too much power.
Umezu: Yes. We knew that DMP's technology had the merit of calculating with the hardware, so we could cut down on the power used.
Iwata: DMP's technology achieves with the hardware most of the shadow calculation usually done by a programmable shader, so even a slower operating frequency can achieve the same results. With today's semiconductor technology, the frequency has a direct influence on power use, so it's very beneficial in that regard.
I find this particular section interesting
The DMP GPU in the 3DS is known to be clocked at 200Mhz, there were rumors that the GPU was underclocked to 133Mhz. That dissapointed some people. But here they talked about how the GPU saves power, and how it performs. Basically it means it saves power, and may actually perform near its "stock" clock speed due to things like the programmable shader
Now, mind you I don't really understand a lot of this but it sounds like, and tell me if i'm mistaken, that even though they are clocking the GPU lower to conserve power, its going to actually be able to perform like its near full power, or Am i mistaken?
Either way, it sounds good.
Also, about the battery
With brightness on high, 3D on and WiFi on, and power save mode off it will last 3 hours
With brightness at its lowest, 3D on and WiFi on, power save mode on it will last 5 hours
With the brightness set on high, turning 3d off increases battery life 25% (so lets say from 3 hours on high, no power save, and wifi on it increases it from 3 hours to 4 hours and 15 minutes, thats the 25% difference)
So, Nintendo already said the other day, that turning the 3D off could double battery life, and set it up to 8 hours potentially, more with WiFi off
You can figure out the numbers your self, but with 3d on, highest brightness, power save off and wifi on it lasts 3 hours, so logically with 3d off, wifi off, power save on, and brightness maybe down to medium, i'm sure you will get 7-10 hours
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