Memory helps the computer's main brain, the CPU, process data. It temporarily stores the data that is being processed by the CPU. If that data is video, there will have to be lots of RAM memory. Video requires an intensive amount of processing. If you are typing a paper or listening to some music, these enterprises do not require a lot of processing. They don't require a lot of RAM memory. Video processing requires at least 4GB of RAM for the desktop computer. Typical desktop use requires one or two gigabytes of RAM.