<P>This is a 16MB SIMM for your NetRaid controller. When your computer runs out of RAM to use while processing requests, it uses the hard drive to temporarily store data it is manipulating, causing what is known as "disk thrashing", or slowdown due to the slight delay that hard drive operation causes. With more RAM memory available, the computer has more space to use and work with, thus allowing it to process without using the hard drive, and speeding up the overall performance of your computer. Help speed up your computer with this RAM memory upgrade. </P>