The Benq SX912 supports a maximum resolution of 1600 x 1200 (UXGA). That's over six times the resolution of a 640 x 480 (VGA) projector, which is the most frequently found resolution supported by data projectors that are a comparable age to the SX912. 640 x 480 (VGA) is also supported by this projector.
A 1600 x 1200 (UXGA) graphics resolution is in fact the best supported resolution across all projectors of this age and type.
Across similar types of data projector the worst supported resolution is 640 x 480 (VGA).