Conflicting information about external display resolution - please help!

I have a MacBook Pro (15-inch, Mid 2009) with the non-reflective screen, Mini Display Port and NVIDIA GeForce 9400M Graphics processor.
According to these technical specifications (http://support.apple.com/kb/SP544), the built-in NVIDIA GeForce 9400M Graphics processor supports full native resolution on the built-in display and up to 2560 by 1600 pixels on an external display.
Armed with this information, I just purchased a shiny, new DELL U2711 (http://accessories.us.dell.com/sna/productdetail.aspx?c=us&cs=04&l=en&s=bsd&sku= 224-8284&redirect=1) external display which has a resolution of 2560 x 1440. Unfortunately, all I can get out of it is 1920 x 1080 (This is the maximum resolution I can select in the monitors system preferences panel.)
So Apple tells me this graphics card supports 2560 x 1600, but I also contacted NVIDIA directly who told me that this particular card's maximum resolution is 1920 x 1080.
Somebody has to be wrong. Is this monitor supported? Am I doing something wrong? Do I need to send this monitor back and buy a smaller display?
Any advice would be greatly appreciated.
O

Well - seeing as nobody could provide any help on this, I'll post the answer in case anybody else has the same problem.
It turns out that the monitor's resolution IS supported by the NVIDIA GeForce 9400M, so the information NVIDIA gave me was wrong.
The issue was the adaptor.
A regular Mini Display > DVI adaptor can only handle a resolution of 1920 x 1080. Turns out I needed a Mini Display > DUAL LINK DVI Adapter, which is a combination of USB and DVI which provides the required resolution of 2560 x 1600.
http://store.apple.com/us/product/MB571Z/A
Hope this is helpful to somebody.

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