The NEC PA722 supports a maximum resolution of 4096 x 2160. That's over three times the resolution of a 1920 x 1200 (WUXGA) multimedia projector, which is the most common resolution supported by 6000:1 contrast ratio projectors that have been around for around the same time as the PA722. 1920 x 1200 (WUXGA) is also supported by this data projector. This projector also support graphics resolutions of 2048 x 1080 and 2560 x 1600 (WQXGA) and 640 x 480 (VGA).
A 4096 x 2160 graphics resolution is actually the best supported resolution across all comparable spec data projectors that have been available for a similar time to the PA722.
The worst supported resolution amongst similar types of projector is 640 x 480 (VGA).