The Display port on your graphics card as well as on your monitor support 2560 x 1600 at 60 Hz. As you have already tried updating the video drivers and it works stable at resolutions at 1280x800 then the DisplayPort cable may not be made to transmit 2560x1600.
My suggestion is to try another DisplayPort to DisplayPort cable (6ft).
There are alot of DisplayPort cables out in the market that cannot transmit beyond 1920x1200 and many more that are not VESA compliant.
DisplayPort 1.1 cables with copper at 32AWG must be less than 2 Meters (6.5ft) long to transmit full 2560x1660.
For more information on Display port you can refer to the link : http://bit.ly/IjjLsi
DELL-Chinmay S
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1.8K Posts
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March 1st, 2013 10:00
Hi scotiwis,
The Display port on your graphics card as well as on your monitor support 2560 x 1600 at 60 Hz. As you have already tried updating the video drivers and it works stable at resolutions at 1280x800 then the DisplayPort cable may not be made to transmit 2560x1600.
My suggestion is to try another DisplayPort to DisplayPort cable (6ft).
There are alot of DisplayPort cables out in the market that cannot transmit beyond 1920x1200 and many more that are not VESA compliant.
DisplayPort 1.1 cables with copper at 32AWG must be less than 2 Meters (6.5ft) long to transmit full 2560x1660.
For more information on Display port you can refer to the link : http://bit.ly/IjjLsi
Hope this helps.