12-28-2017 03:00 AM - edited 12-28-2017 05:32 AM
I have Thinkpad T440 (i5-4300U, Intel HD Graphics 4400). I am considering buying a LCD display with WQHD resolution (2560 x 1440) and I am wondering wheather it will work with T440. Important thing, I want to work it with 60 Hz refresh ratio.
According to the specification  the resolution is supported: "3840x2160@30Hz (DisplayPort via Mini DisplayPort cable on integrated models)", but the refresh ratio is pretty low - 30Hz.
The specification  for i5-4300U, Intel HD Graphics 4400 says something different: "Max Resolution (DP)‡ 3200x2000@60Hz". So the refresh ration is higher than what T440 specification states - 60Hz.
Also quick reference quide to Intel processors  confirms the resolution and the refresh ratio: "U-Processors: 3200 x 2000 @ 60 Hz, 3840 x 2160 @ 30 Hz".
Is 2560 x 1440 @ 60 Hz supported on T440?
I hope that ThinkPad T440 specification is not accurate enough and that limit to 30 Hz refresh ratio only applies for 4k resolution (3840 x 2160).