2560x1440
Intel Core i5-9400F testing with a Gigabyte Z390 UD (F8 BIOS) and Gigabyte NVIDIA GeForce GTX 1660 Ti 6GB on Ubuntu 19.04 via the Phoronix Test Suite.
HTML result view exported from: https://openbenchmarking.org/result/1908166-HV-2560X144069.
Unigine Heaven
Resolution: 2560 x 1440 - Mode: Windowed - Renderer: OpenGL
Unigine Heaven
Resolution: 2560 x 1440 - Mode: Fullscreen - Renderer: OpenGL
Phoronix Test Suite v10.8.4