I'm also very curious about this because the only two things I do that might stress a MBA are video editing and FSX. I actually passed on the 2011 model because of the HD3000 but from my research the HD4000 should be able to run FSX at least as well as my current computer (2.4ghz core2duo, nvidia 9600m gt). But I am interested to see the framerates at medium and high quality because right now I only get about 25 on relatively low settings.