The highest resolution supported by the Benq CH100 is 1920 x 1200 (WUXGA). That's over seven times the resolution of a 640 x 480 (VGA) projector, which is the most common resolution supported by data projectors that have been around for around the same time as the CH100. 640 x 480 (VGA) is also supported by this data projector.
This projector's resolution (1920 x 1200 (WUXGA)) is in fact the best supported resolution amongst all new data projectors.
Amongst comparable types of projector the worst supported resolution is 640 x 480 (VGA).