How To Use Scanline Sync And Cap FPS In RivaTuner

What is Scanline Sync and FPS Capping in RivaTuner?

Scanline Sync is a software-based solution to reduce screen tearing, offering lower input lag compared to traditional V-Sync methods. It works by adjusting the tearline to a less noticeable part of the screen, making it an alternative to hardware-based adaptive sync technologies like G-Sync and FreeSync.

Setting Up RivaTuner Statistics Server (RTSS)

To use Scanline Sync and cap FPS in RivaTuner, you first need to set up RTSS. Here are the steps:

1. Install RTSS: RTSS is often bundled with MSI Afterburner, but it can also be downloaded separately. Ensure you have the latest version installed.
2. Open RTSS: Launch RTSS from your start menu. If it doesn't appear immediately, check for its icon and right-click to open the main window.
3. Create a Game Profile: Click the green "Add" button at the bottom-left corner of the RTSS window to create a new profile for your game. Select the executable file of the game you want to configure.

Configuring the Game Profile

1. Load the Game Profile: Once the profile is created, load it by clicking on it in the RTSS window.
2. Set Framerate Limit to 0: To enable Scanline Sync, you must set the framerate limit to 0. This does not mean your frames will be capped at 0; it simply disables the FPS capping function, allowing Scanline Sync to work.

Enabling Scanline Sync

1. Adjust the Scanline Sync Value: With the framerate limit set to 0, you can now adjust the Scanline Sync value. This value is not a framerate limit but rather coordinates for the tearline. Start by subtracting 150 to 200 from your vertical resolution (e.g., 930 for a 1080p screen). Adjust this value in increments of 10 until the tearline is moved to a less noticeable part of the screen.
2. Test and Adjust: While in the game, alt-tab back to RTSS and adjust the Scanline Sync value. Switch back to the game and test by moving around to see how the tearline behaves. Continue adjusting until the tearing is minimized or practically invisible.

Additional Tips for Optimizing Scanline Sync

1. SyncFlush Values: You can further tweak the performance by adjusting the SyncFlush values (0, 1, or 2). These values help in managing the tearline's position and can be set on a game-by-game basis.
2. Combining with Strobing: If your monitor supports strobing (ULMB/Lightboost/Dyac), Scanline Sync can work in combination with these features, providing a best-of-both-worlds scenario with no lag, no blur, and no tearing.
3. Monitor Selection: If you are using multiple monitors, ensure that RTSS is syncing against the correct display. You can specify the monitor in the config file using the SyncDisplay setting.

FPS Capping

1. Global FPS Cap: To set a global FPS cap, click the "Global" profile in RTSS and set a framerate limit that matches your monitor's refresh rate. This helps in preventing screen tearing and maintaining a consistent framerate.
2. Per-App FPS Limits: You can also set FPS limits on a per-application basis. This is useful for games that do not have built-in FPS capping options.

Common Issues and Solutions

1. High GPU Load: Scanline Sync works best when GPU load is low. If your GPU load is high, you may experience tearing even with Scanline Sync enabled. Consider using Fast Sync or Enhanced Sync to alleviate this issue.
2. Multi-Monitor Setup: If you are using multiple monitors, ensure that RTSS is configured to sync against the correct display to avoid issues like capped FPS at 60 on higher refresh rate monitors.

By following these steps and tips, you can effectively use Scanline Sync and cap FPS in RivaTuner to enhance your gaming experience by reducing screen tearing and input lag.