The NEC PA671 supports a maximum resolution of 4096 x 2160. That's over three times the resolution of a 1920 x 1200 (WUXGA) projector, which is the most common resolution supported by projectors of this type and age. 1920 x 1200 (WUXGA) is also supported by this projector. In addition, this NEC projector 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 projectors that have been available for around the same time as the PA671.
A 640 x 480 (VGA) graphics resolution is the worst supported resolution across similar types of projector.