The highest resolution supported by the NEC PA621 is 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 projectors of this spec and age. 1920 x 1200 (WUXGA) is also supported by this projector. This multimedia 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 amongst all 6000:1 contrast ratio data projectors that were released more than two years ago.
A 640 x 480 (VGA) graphics resolution is the worst supported resolution across similar types of projector.