Unable to set UHD in display settings


i bought lg 27ud88-w 27" ips uhd (max resolution: 3840x2160) pair titan x (maxwell) card in macpro (mid 2012). unable set max supported resolution.

latest web drivers titan x. checked both display port & hdmi ports, same issue on both.

monitor detected uhd, under "scaled" display settings max 3360x1890

issue?


screen shot 2017-10-04 @ 4.06.36 am.png screen shot 2017-10-04 @ 4.06.43 am.png screen shot 2017-10-04 @ 4.06.53 am.png screen shot 2017-10-04 @ 4.07.09 am.png
 

how if hold "option" , click scale?

monitor set dp 1.2? or dp 1.1?
 


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