Set macOS VRAM persistently

sysctl.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
    <dict>
        <key>Label</key>
        <string>com.user.sysctl</string>
        <key>ProgramArguments</key>
        <array>
            <string>/usr/sbin/sysctl</string>
            <string>-w</string>
            <string>iogpu.wired_limit_mb=122880</string>
        </array>
        <key>RunAtLoad</key>
        <true />
        <key>LaunchOnlyOnce</key>
        <true />
        <key>UserName</key>
        <string>root</string>
    </dict>
</plist>

Per reddit:

git clone [email protected]:893aaa5ef0b38a923e5a46ee88920ba7.git macos_sysctl && cd $_
sudo cp sysctl.plist /Library/LaunchDaemons/com.user.sysctl.plist
sudo launchctl load /Library/LaunchDaemons/com.user.sysctl.plist
sudo reboot
sudo sysctl iogpu.wired_limit_mb