The question I will answer today is "What is the Wii U's graphics card and what resolution will it support? Also, I have read some articles saying that the Wii U will be underpowered compared to the Xbox 720 and PS4 and won't support as high of resolution as them, is this true," by anonymous. The following is my answer.
AMD has confirmed that the Wii U is going to use a custom-designed Radeon HD similar to the Radeon R700 architecture. Some places such as IGN have said that the type of Radeon R700 that it's going to use is most like that of the Radeon HD 4850 (I believe it is most likely that the Wii U's version is on par or more powerful). Assuming that this is true, I googled the Radeon HD 4850 and found its official specification page. As you can see in the image below the Radeon HD 4850 supports 2560x1600 resolution also known as WQXGA.
That is 4,096,000 pixels which is more than 1.9 times higher resolution then full HD (1920×1080). It is even higher than 2K resolution. So when someone tells you that the Wii U is underpowered, that is not true (here's a good article comparing the Radeon HD 4850 and the HD Radeon 6670 [the Xbox 720's rumored graphics card]). Recently some people have gotten it into their minds that the Xbox 720 and PS4 will support higher resolutions than the Wii U, but it is most likely not true; one reason is that there are hardly any TVs that support 2560x1600 resolution.