The highest resolution supported by the VPL-VW320 is 4096 x 2160. That's over twenty-eight times the resolution of a 640 x 480 (VGA) projector, which is the most common resolution supported by projectors that were released around the same time as the VPL-VW320. This projector also supports a graphics resolution of 3840 x 2160.
This projector's resolution (4096 x 2160) is actually the best supported resolution amongst all comparable spec projectors that are a similar age to the VPL-VW320.
The worst supported resolution across similar types of projector is 640 x 480 (VGA).