Best way to turn down hz / fps display and pc outputs?

[Lundgreen]

Hi

 

Thanks to the forum, I know that I need to 'turn down' the Hz of my moniter to make Freesync run better. 

[It was causing flickering in windows as well as in games]

 

 My monitor: 31 inch Dell d3220dgf Freesync2, 2560x1440, 165 hz

 

What's the best way to turn down the amount of hz or fps the display and pc outputs?

I know there's some software called GRU? is that the easiest way to edit it?

PC it's running on:
AMD Asus TUF B450M-Plus AM4 bundkort 
AMD Ryzen 5 3600 4.2GHz 6-core AM4 CPU 
2x DDR4-3200 Corsair 8GB Vengeance RAM 
SSD Intel 660P 1TB NVMe M.2 (SSD)
AMD Radeon RX 5700XT 8GB ROG Strix 
CASE Corsair Carbide VG-275R TG Kabinet 
PSU Corsair VS550 550W 80+ 

 

[Mamonos]

Some games have a built-in limiter, otherwise you can use AMD Radeon Chill or MSI Afterburner with RTSS.