While there may not be a definitive solution mentioned in the provided conversation, there are a few general troubleshooting steps you can take to address issues with Arma 3 being capped at 4GB of RAM:
Check Game Settings: Ensure that you've adjusted the correct settings within the game. This includes the "maxMem" value in the Steam launch options, as well as any in-game settings related to memory usage.
Verify Game Files: Use Steam's built-in feature to verify the integrity of the game files. Right-click on Arma 3 in your Steam library, go to Properties > Local Files, and click "Verify Integrity of Game Files." This ensures that your game files are not corrupted.
Update Graphics Drivers: Make sure your graphics drivers are up to date. Outdated or incompatible drivers can sometimes cause performance issues.
Review Mods/Add-ons: If you are using any mods or add-ons, they might be contributing to the issue. Try disabling them one by one to see if the problem persists.
Reinstall the Game: If none of the above steps work, consider uninstalling and reinstalling Arma 3. This can sometimes resolve issues related to game files and configurations.
Check for Game Updates: Ensure that you have the latest updates for Arma 3 installed. Developers frequently release patches and updates that may address performance issues.
Contact Official Support: If the problem persists, consider reaching out to the official support channels for Arma 3. They may be able to provide specific guidance or solutions tailored to your issue.