Resolution Oddity

k, so, i have an x800xl and i have it set up on dual monitors
both of the monitors are identical crt's and i found out that they both go up to 1520x1140 resolution
i have the one set up fine, but the monitor on the secondary output, which is connected via a D-SUB-to-DVI converter, will only go up to 1280x1024 in the display properties' settings tab. is this a limitation on the card itself, the drivers (omega 2.6.87), or is windows xp fucking with me?

Reduce the vertical frequency, maybe your monitor can't do 1520x1140@70Hz, but @60Hz. If you are absolutely sure about your monitor's parameters get PowerStrip and make a custom .inf-File.
What fucked up res is 1520x1140 anyway ???????????