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12-28-2017

CZ

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Thinkpad T440 - support of WQHD resolution (2560 x 1440) for external display

2017-12-28, 11:00 AM

Hello,

 

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 [1] the resolution is supported: "3840x2160@30Hz (DisplayPort via Mini DisplayPort cable on integrated models)", but the refresh ratio is pretty low - 30Hz.

 

The specification [2] 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 [3] 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).

 

[1] http://psref.lenovo.com/syspool/Sys/PDF/ThinkPad/ThinkPad%20T440/ThinkPad_T440_Platform_Specifications.pdf

[2] https://ark.intel.com/products/76308/Intel-Core-i5-4300U-Processor-3M-Cache-up-to-2_90-GHz

[3] https://software.intel.com/en-us/articles/quick-reference-guide-to-intel-processor-graphics

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