The most resolution of the 34UM88C-P is 2160p. That's over two times the resolution of a 1080p PC display, which is the most frequently found resolution. 1080p is also found on this flatpanel monitor.
A 2160p video mode is actually the best resolution across all medium monitors that were launched around the same time as the 34UM88C-P.
The worst resolution amongst comparable types of PC monitor is 480p.