-Windows 10: Click on the start button and select System. Installed memory (RAM) is displayed under the System section.
-Windows 8: Select File Explorer. Right-click Computer and select Properties to display System. Installed memory (RAM) is displayed under the System section.
-Windows 7 Click on the Start button and right-click Computer. Select Properties to display System. Installed memory (RAM) is displayed under the System section.
-MacOS X: Select "About This Mac" or "About This Computer" from the Apple menu in the upper left corner of your Desktop.
-Linux: Open a terminal window and enter the following command: cat /proc/meminfo