With the new Raspberry Pi 4, it is possible to to display output at 4K 60FPS. You also need to make sure you are using HDMI port near to type C power port.
The default output of Raspberry Pi is set to 4K 30FPS, we need to make change in
/boot/config.txt file. There are two methods to change this setting.
Method 1: Using raspi-config
Open a terminal window on the Raspberry Pi and run the below command:
Navigate to Display options -> Composite and select Enable 4Kp60, finish and reboot. You will get 4K 60FPS on your Raspberry Pi.
Method 2: Editing
/boot/config.txt file with your favourite text editor and add this line at to end of the file:
Save the file, reboot the pi. After reboot, you will get 60FPS at 4K resolution.