nope, every bit as choppy as full resolution
Also, what I mean by choppy is that every five seconds or so, the video stops for about a second while the audio sort of keeps going, so by the first time you see Anderson in the intro, the video is behind the sound by a good ten seconds. (and that's besides just making it plain unplayable)
I've updated my CCC to 12.2 (I have a single HD4870) and rechecked the integrity of the installation but nothing's different.
edit: hard reboot fixed it