Yes, it is definitely okay to pair a Ryzen 5 5600G with a GTX 1660 Super. The Ryzen 5 5600G is a powerful processor with integrated graphics (iGPU), but if you are using a dedicated graphics card like the GTX 1660 Super, you can disable the integrated graphics in the BIOS to ensure that your system prioritizes the GTX 1660 Super for graphics processing.
Disabling the iGPU will not only prevent any potential conflicts between the integrated and dedicated graphics, but it can also help improve overall system performance by allowing the GTX 1660 Super to handle all graphics-related tasks without interference.
Just make sure to connect your monitor to the GTX 1660 Super's video output ports to ensure that you are using the dedicated graphics card for display output.