The Ricoh PJ WX6170N supports a maximum resolution of 1920 x 1080 (HD 1080). That's over six times the resolution of the most common supported graphics resolutions of 640 x 480 (VGA) (which is also supported by this projector). In addition, this Ricoh projector supports a supported graphics resolutions of 1280 x 800 (WXGA).
This projector's resolution (1920 x 1080 (HD 1080)) is actually the best supported resolution across all data projectors of this age and spec.
Across comparable types of projector the worst supported resolution is 640 x 480 (VGA).