100fps is way to low for a RX5600XT!
even my Laptop with RX560X get 160-220fps at 1440x1080 in CSGO...
0. disable Win10 auto-driver-install
1. use DDU in safe-mode to clean old driver
2. download latest driver from amd.com/en/support
3. install driver and reboot
4. test again
PC: R7 2700X @PBO + RX 580 4G (1500MHz/2000MHz CL16) + 32G DDR4-3200CL14 + 144hz 1ms FS P + 75hz 1ms FS
Laptop: R5 2500U @30W + RX 560X (1400MHz/1500MHz) + 16G DDR4-2400CL16 + 120Hz 3ms FS