Sure you can use the task manager only to check the RAM usage and also for many other functions. However, for those who want to monitor the amount of usage over time, and do not want to open a any prompt window, you can just use MemInfo.
MemInfo add a small icon on the Task Bar in Windows, and show RAM usage figures that are updated in real-time. Users can also click on it and look at the top ten applications that use high RAM at any time, and off it continues to pass through, thus emptying the use of your computer's RAM memory.
For those of you who are interested can download MemInfo to your Windows computer, and began to monitor the use of RAM easily.
Download MemInfo For Windows