It supports 800x480 and that is the default resolution.
However, it is impossible to resolve. I did trace it back, and the video processing chip is a little black. So I have blown my 800x600 and 800x480 resolutions. 640x480 and 1024x768 work just fine.
Also at least my screen, automatically seems to scale the image. I do not have any sort of stretched image, so I have no clue what people talk about when they want 800x480. The standard resolutions look absolutely perfect.

