Lenovo ThinkVision P40w-20 39.7" 5K Ultrawide Curved Monitor - Manual (Page 23)

Chapter 1 Get started with your monitor 1-19
PC Monitor OSD setting Supported USB Speed
DP 1.2 DP 1.4 USB
Thunderbolt 4 4096x2160@60hz 5120x2160@60hz USB 3.2 Gen 1
Thunderbolt 3
(Alt Mode DP 1.4) 4096x2160@60hz 5120x2160@60hz USB 3.2 Gen 1
Thunderbolt 3
(Alt Mode DP 1.2) 4096x2160@60hz 5120x2160@50hz USB 3.2 Gen 1
USB-C Gen 1
(Alt Mode DP 1.2) 4096x2160@60hz 5120x2160@50hz USB 2.0
USB-C Gen 2
(Alt Mode DP 1.4) 4096x2160@60hz 5120x2160@60hz USB 2.0

Above tables is based on HDR setting off in Windows OS.

The best resolution is depending on your PC too.