The highest resolution supported by the Optoma X351 is 1920 x 1200 (WUXGA). That's over seven times the resolution of a 640 x 480 (VGA) data projector, which is the most common resolution supported by multimedia projectors of a similar age and spec to the X351. 640 x 480 (VGA) is also supported by this data projector. This projector also support supported graphics resolutionss of 1024 x 768 (XGA), 1280 x 1024 (SXGA), 1400 x 1050 (SXGA+), 1440 x 900 (WXGA+) and 1600 x 1200 (UXGA) and 800 x 600 (SVGA).
This data projector's resolution (1920 x 1200 (WUXGA)) is actually the best supported resolution across all data projectors that have been available for a similar time to the X351.
The worst supported resolution amongst comparable types of data projector is 640 x 480 (VGA).