For Windows: Right mouse-click on the "My Computer" icon and select "Properties." The total memory is calculated and displayed under the "General" tab in the system properties window.

You can also use CPU-Z to help you find out more specific information about your computer:

1. Download CPU-Z from our website.
2. Unzip the file to any location.
3. Locate the unzipped folder and execute the file cpuz.exe
4. After the program loads, click the Mainboard tab. This contains information about the specific brand and model motherboard in your computer.
5. Now click the SPD tab. This contains information about the specific type and specification of memory in each memory slot.
6. If this information doesn't allow you to locate specific upgrades for your computer on our website, then click the About tab.
7. Now click the HTML Dump button at the bottom of the window.
8. Choose any location to save the cpuz.htm file, then click Save.
9. Email us the cpuz.htm file and we can assist you further. It will be in the location where you just saved it.
10. For more information, go to the CPUID Website

For Apple Computers: Click "About This Mac" or "About This Computer" from the Apple menu. (Far top left of the screen). This will provide information about your Mac's total memory (built-in memory plus DIMMs or SIMMs installed).