I'm have RX590 RED DRAGON, electron22blue3 and dislayport-vga cabel CCP-DPM-VGAM-6 (10.8Gbps, 2048*1538 24bit)
My computer see this monitor correctly.
At driver 20.4.1 i'm cant make resolution better 1400*1050*85hz with manual or standard parameters.
Adapter display-port can to conversion that resolution. Monitor can work with more quality resolutions 2048 x 1536 @ 50 to 86 Hz. RX590.... no comments.