The NEC PX800X supports a maximum resolution of 1920 x 1200 (WUXGA). That's over seven times the resolution of the most common graphics resolution of 640 x 480 (VGA) (which is also supported by this projector). In addition, this data projector supports a graphics resolution of 1024 x 768 (XGA).
This data projector's resolution (1920 x 1200 (WUXGA)) is in fact the best supported resolution amongst all projectors of this type and age.
A 640 x 480 (VGA) graphics resolution is the worst supported resolution amongst comparable types of data projector.