Khaos Tian

@KhaosT It is interesting that there are many websites which claim 4k@60Hz output on rMBP and refer to your original tweet. Did you notice?

@NadithRahman maybe it’s because my language isn’t clear… I was trying to say both rMBP and nMP gets ability to choose upscaled resolution

@KhaosT Folks confirm 4k@60Hz with high-end 15'' Haswell rMBP on Dell UP2414Q: https://discussions.apple.com/message/25098487#25098487 … What is your monitor?

@NadithRahman UP2414Q + High-end 15” Haswell. If I disable 750M, there won’t have any output on external monitor(a black screen)

@KhaosT Exactly same monitor and rMBP configuration but no 4k@60Hz on your setup but people are getting 60Hz. How come?? Any idea as to why?

@NadithRahman Are you sure they actually get 60Hz? Initially I thought it’s 60Hz on rMBP but later I feel it’s still 30Hz

@KhaosT He says "Good news everything works w/ 10.9.3.That is 3840x2160@60Hz using a display port cable+I get to choose a scaled resolution

@KhaosT (3840x2160, 3200x1800, 2560x1440, 1920x1080 or 1280x720)... I only have a Dell UP2414Q to test with...Mine is a late 2013 MBP 750M."