The highest resolution supported by the Benq MX717 is 1600 x 1200 (UXGA). That's over six times the resolution of a 640 x 480 (VGA) projector, which is the most common resolution supported by 5300:1 contrast ratio data projectors that have been available for around the same time as the MX717. 640 x 480 (VGA) is also supported by this projector.
A 1600 x 1200 (UXGA) graphics resolution is actually the best supported resolution across all projectors that were launched around the same time as the MX717.
A 640 x 480 (VGA) graphics resolution is the worst supported resolution across comparable types of projector.