4K output over HDMI on laptop

I recently bought an LG 4K Freesync monitor, which looks amazing on my desktop. However, when connecting my laptop over HDMI (Asus N56VB), I can only use it in 1080p and don't get an option for higher resolutions, even though my discrete GPU (Nvidia 740m) should be able to output a 4k image. I think that the problem is that it uses the integrated GPU (intel HD graphics 4000), which doesn't output 4K. Anyone have an idea how I can get higher resolutions to show up in windows settings?

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