Question Display or Graphics card?

[mrshinsa]

I have an LG 43UD79-B 43" monitor hooked up to a GT640 video card.

LG 43'' Class 4K UHD IPS LED Monitor (42.5'' Diagonal) (43UD79-B) | LG USA

Get information on the LG 43'' Class 4K UHD IPS LED Monitor (42.5'' Diagonal) (43UD79-B). Find pictures, reviews, and tech specs.

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When moving my mouse around and clicking things, I feel like there is a bit of lag.
Is it because of this monitor's low refresh rate (60hz)? Or because my graphics card is struggling to output such high resolution?

 

[Stuka87]

While 4K is a pretty high resolution for a lowly GT640, there could also be some input lag going on.

Open up task manager, click on GPU, and see what the load is with just regular clicking around.

 

[Spjut]

Have you set your TV to "PC mode"?

Kepler natively only supports 4k 30 hz though, and a driver hack makes 4k 60 possible, which works well for video but poorly for other images.

NVIDIA Kepler Cards Get HDMI 4K@60Hz Support (Kind Of)

www.anandtech.com

 

[SamMaster]

Have you set your TV to "PC mode"?

Kepler natively only supports 4k 30 hz though, and a driver hack makes 4k 60 possible, which works well for video but poorly for other images.

NVIDIA Kepler Cards Get HDMI 4K@60Hz Support (Kind Of)

www.anandtech.com

I can confirm that 4k 30Hz is laggy. We have several conference rooms where I work configured with TVs, and by default they run 4K 30Hz and the keyboard and mouse is very laggy. It goes away when set to 60Hz.

 

[EXCellR8]

Yea upgrade the GPU and grab a good cable if you don't already have one. Otherwise, is what it is.