How can my iMac support 2560x1080 external monitor (LG 29EA93)

How can my iMac support 2560x1080 external monitor (LG 29EA93)?
Please, help on this issue?
iMac 2012 Late
NVIDIA GeForce GT 640M 512MB
OS X 10.8.5 (12F37)

Thanks for your prompt  answer.   
I still have problems and I don't know why.

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