What monitor are you using and what is your video output set to?

 

The flickering and jaggedness you're experiencing in games can be quite frustrating, but there are several potential solutions to address this issue:

Anti-Aliasing (AA): Enabling anti-aliasing in your game's settings can help smooth out jagged edges and reduce flickering. Try different AA modes (e.g., FXAA, MSAA, or TAA) to find the one that works best for your system without compromising performance too much.

Resolution: Increasing your screen resolution can also help reduce jagged edges. However, this might require a more powerful GPU to maintain smooth gameplay.

Graphics Drivers: Make sure you have the latest graphics drivers for your GeForce RTX 3060. Nvidia frequently releases driver updates that can improve game compatibility and performance.

V-Sync: Enabling V-Sync can sometimes help by synchronizing your monitor's refresh rate with your GPU's rendering rate, reducing screen tearing and flickering.

Game-specific settings: Some games have specific settings to mitigate flickering or aliasing. Check the in-game options and experiment with different settings.

Nvidia Control Panel: You can also try adjusting settings in the Nvidia Control Panel, such as Anisotropic Filtering and Texture Filtering Quality, to improve image quality.

Monitor Refresh Rate: Ensure that your monitor is set to its native refresh rate in both Windows settings and the game's settings.

Check for Overheating: Excessive heat can sometimes cause graphical artifacts. Ensure your GPU isn't overheating by cleaning dust from your PC and optimizing airflow.

Monitor Cable: Ensure that your monitor cable (HDMI, DisplayPort, etc.) is securely connected, as loose connections can lead to display issues.

If the problem persists after trying these steps, it may be worth seeking help from the game's community or the manufacturer's support forums for your specific GPU model. They might provide further insights or solutions tailored to your hardware and the games you're playing.

 

Thanks for taking the time to reply.
I noticed another issue with polygon seems showing and stuff. See screenshots.
I also tried reinstalling gfx drivers....