Now isn’t the Eee PC actually rendering the game but instead it is a new version of StreamMyGame which allows users to play games from their more powerful PCs on their lower end notebooks and desktops by streaming the video from the game over the network.
Although I’ve never played Crysis I would guess that it wouldn’t be that great on a 7″ screen, but on the other hand it is a cool thing that is now at least possible.