====== Ubuntu - GPU - AMD GPU - Monitor - Manually - Check the GPU VRAM Frequency ======
cat /sys/class/drm/card0/device/pp_dpm_mclk
returns:
0: 96Mhz *
1: 456Mhz
2: 772Mhz
3: 1249Mhz
**NOTE:** The line with the asterisk is the current VRAM frequency.