15' MBP w/ discrete and P2715Q - SwitchResX not working

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i'm @ loss here, i'm asking help!

have work issued late '13 15" macbook pro on 10.9.5 discrete gpu , dell p2715q 4k monitor. should able native 4k or several scaled hidpi / retina resolutions setup - can't. os x , switchresx allow me go 2560x1440 (scaled). on monitor, thats blurry , it's hard code this.

i've tried googling issues no success. i've been playing switchresx morning , haven't figured out either. i've created custom resolutions of retina resolutions, never active on reboot - says "invalid"

pointer on how proceed here? driving me nuts!

have personal mid-'14 , has no issues display, works perfectly.

in advance!
 

which refresh rates using?
late 2013 can't 4k 60hz, while mid 2014 can.
 


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