If you are looking for an appropriate RAM as per your system and requirements, you should keep certain factors. Whether you are bringing it for a laptop or desktop should be the first consideration. Next up is the RAM capacity. If you are doing just the normal work on a computer with limited word files, excel files or browser tabs, then 4GB should be enough. On the other hand, gamers or users who have heavy software like Adobe photoshop in their system can buy cheap 8GB RAM for a laptop online or even go for 16GB capacity. Price, brand, clock time, and CPU and OS limits are other factors that can affect your purchase.