If you want ludicrous frame rates, sure. You might not get that in all titles with an i5-8600k, but it will make a pretty good try at it. Really depends on the exact game titles and your settings. GTX 1080 will probably struggle a bit on the very high end games if you max out the settings, just about exactly as hard as running 2560x1440@144hz, which the 1080 can't quite do on recent games at max.