[link|http://www.princetongraphics.com/product_sen751.htm|This] page at Princeton Graphics says:

1280 x 1024 Native Resolution:
Displays a crisp, clear 1280 x 1024 native resolution and is capable of 640 x 480 to 1600 x 1200 resolutions.*

Maximum/Native Resolution:
UXGA 1600 x 1200 Maximum Resolution*
XGA 1280 x 1024 Recommended Resolution

Compatibility:
Digital: Digital Visual Interface (DVI), up to 1280 x 1024
Analog: Scales up to 1600 x 1200*
VESA\ufffd 1280 x 1024 @ 85/75/60Hz
VESA\ufffd 1024 x 768 @ 85/75/70/60Hz
VESA\ufffd 800 x 600 @ 85/75/72/60/56Hz
VESA\ufffd 640 x 480 @ 85/75/72/60Hz
Super VGA, VGA, Macintosh\ufffd 832 x 624@ 75Hz,
Power Mac\ufffd and more

* Analog Input Mode Only.


They are doing some interpolation tricks, somehow, to get 1600x1200 when driven by analog signals. But physically, the SENergy 751 is a 1280x1024 LCD. The .PDF Specification Sheet says the active screen is 13.61\ufffd x 10.89\ufffd (345.6mm x 276.48mm). At 0.27 mm per pixel, there are 1280 pixels across and 1024 pixels up, so it adds up.

Cheers,
Scott.