[hypertextcoffee]

>(they fail miserably with 4k resolution) I use an external GTX 1070 over Thunderbolt 3 on a 2017 Dell XPS 15, and have 2 2160p monitors. 4K gaming is no problem at the refresh rates that 4K offers (usually 60Hz)

[ionised]

> 4K gaming is no problem at the refresh rates that 4K offers (usually 60Hz)

Subjective. Depends entirely on the settings you are using and the resulting frame rate at that resolution.