ATI Technologies RADEON 9500 SERIES - Manual (Page 14)

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2 Click OK or Apply to save the changes.
Ratiometric Expansion
Your RADEON 9 500 Series card offers ratiometric
expansion (or digital panel scaling as it is commonly
known). This expands a low resolution image to fill a
higher resolution panel. However, ratiometric expansion
is only available on the Primary display. Therefore, if a
flat panel display (FPD) is set as Secondary, the
Extended Desktop mode is disabled and the resolution is
less than the FPD’s native resolution. This causes the
FPD to default to center mode.