Ah I see, so in conclusion. Since this monitor does not support VRR over HDMI 2.1, therefore it won't work regardless of the graphics cards I'm using from NVIDIA unless I have an AMD Radeon graphics cards, is that right?
My brother is using the Samsung monitor S27R350 (75hz) and this monitor has AMD Free-sync, with HDMI and D-sub ports, and no DisplayPort.
He wants to utilize the Free-sync technology. Although he has an NVIDIA GPU 10 series (GTX 1650), I believe that we can still use Free-sync on an NVIDIA GPU...