RAM effects how much stuff your computer can do at the same time. If you have ever opened up 1 Internet Explorer window and your computer ran fine, but started to slow down after you opened up 20, you are probably running low on RAM. Basically, RAM is short term memory. The more RAM, the more stuff you can do at the same time.

Most modern recording programs such as Cubase (my favorite), Logic, Sonar, etc will chew right through RAM if you let them. If you are using samples of any kind, don't even think about the quantity. Just order 2GB of RAM if using Windows XP.

The next generation of Windows (after XP) is supposed to have a much larger RAM capacity and that could be of huge benefit to people using drum samples like DFH Superior by Toontrack.

Make sure the RAM you select will work with your motherboard.