The highest resolution supported by the MX631ST is 1920 x 1200 (WUXGA). That's over seven times the resolution of a 640 x 480 (VGA) multimedia projector, which is the most frequently found resolution supported by data projectors of this age and spec. 640 x 480 (VGA) is also supported by this projector.
A 1920 x 1200 (WUXGA) supported graphics resolutions is in fact the best supported resolution across all projectors that were released around the same time as the MX631ST.
A 640 x 480 (VGA) supported graphics resolutions is the worst supported resolution amongst similar types of data projector.