The RAM memory is the memory where the computer stores the data that is being used at that moment in time. If the computer works slower or freezes, you can check if there was an error in the RAM. MemTest will complete a full check on all the modules.
To be able to use MemTest you have to close all your programs. Furthermore, the analysis can take up to 20 minutes. MemTest also allows you to choose the amount of MB that you want the application to analyze. Once it has finished scanning, you'll be able to see the errors that is has detected and the RAM memory's status.
Use MemTest to check how your RAM memory is working and make sure it doesn't have any errors.