Answer
There are two reasons will affect the resolution support. One is chipset driver and the other is monitor. First you have to make sure monitor is no problem to support this mode. Then check nVidia driver. Here are the links to nVidia webpage to obtain the supporting drivers.
For example,
- Windows XP 32bit
http://www.nvidia.com/object/nforce_winxp_15.24.html
- Windows Vista 32bit
http://www.nvidia.com/object/nforce_vista_15.24.html
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