Adding more RAM is in-expensive but this is the first tweak you implement if you are experience a slower PC. This is will noticeably improve your system performance.
Nowadays, a home and office computer has to work multiple tasks. Most software have been specified the minimum amount of RAM needed to install and play. For example, Harry Potter And The Prisoner of Azkaban requires 256 MB. Computer also needs some RAM for background tasks as well as to run the game. Photo-editing software and web browsing also consume RAM. Some day suddenly your computer can't keep up.
