Resolved Why is my 30 inch Apple Cinema displaying in 1280x800 max?


i plugged apple cinema 30 inch imac 2009 27" , have choice between 1280x800 , 1024x640.

wrong? imac 27 can't achieve max resolution?
--- post merged, jan 8, 2016 ---
nevermind, found solution: need mini displayport dual-link dvi
 



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