The highest resolution supported by the Optoma EX855 is 1920 x 1200 (WUXGA). That's over seven times the resolution of a 640 x 480 (VGA) projector, which is the most frequently found resolution supported by projectors that have been available for more than two years. In addition, this data projector support graphics resolutions of 1024 x 768 (XGA), 1280 x 1024 (SXGA), 1280 x 720 (HD 720), 1280 x 768 (WXGA), 1400 x 1050 (SXGA+) and 1600 x 1200 (UXGA) and 800 x 600 (SVGA).
This projector's resolution (1920 x 1200 (WUXGA)) is in fact the best supported resolution amongst all projectors of a similar age and spec to the EX855.
A 640 x 480 (VGA) graphics resolution is the worst supported resolution amongst comparable types of projector.