The Zelda demo, or "HD Experience" as Nintendo calls it, is almost certainly running at a native resolution of 720p, with no anti-aliasing and seems to be locked at 30 frames per second with v-sync engaged
At this point we're speculating, but our guess is that Wii U's RAM is based on GDDR3 or DDR3 - far more cost efficient than the top-end GDDR5 and the hitherto non-existent DDR4. In terms of the make-up of AMD's custom Radeon GPU, we reckon it probably has more in common with the Radeon HD 4650/4670 as opposed to anything more exotic.
japanischer Garten Demo
We're not entirely clear on resolution and anti-aliasing here, but it's definitely not a 1080p demo, so our best guess is that like the Zelda HD experience, it's also running at 720p.
