The Acer X133PWH supports a maximum resolution of 1920 x 1200 (WUXGA). That's over seven times the resolution of the most frequently found graphics resolution of 640 x 480 (VGA).
A 1920 x 1200 (WUXGA) graphics resolution is actually the best supported resolution across all multimedia projectors of a similar spec and age to the X133PWH.
A 640 x 480 (VGA) graphics resolution is the worst supported resolution across similar types of projector.
If you are looking for a projector with a higher resolution then you might want to look at the Benq MX768 ($1,999.00) (1600 x 1200 (UXGA)|640 x 480 (VGA)) which also has a higher rating.