Adding RAM to a computer can be a cheap and easy way to improve performance.
RAM (Random Access Memory) is the active memory that your computer uses to think about what it is doing. The memory is lost when your computer shuts down. If you don’t have enough memory, the computer will have to also use a swap file on your hard drive which is slower.
Modern computers typically benefit from at least 1GB of RAM. Windows Vista 32-bit version will recognize up to 3.5GB of RAM, while Vista 64-bit and Mac OS X will support virtually as much RAM as you can afford. Adding RAM will especially help if you are running several programs at once or if you are working with large files such as photos and videos.
I just got a Virginia client this Acer laptop from NewEgg on special for $400. The CPU is a decent dual-core, so the real bottleneck on this system is the included 1GB of RAM. Windows Vista needs more RAM than XP. Additional RAM also helps because this laptop shares its RAM for use with the video card. This replacement 2 GB RAM from NewEgg only cost $38. That gives this laptop a noticeable speed boost, making the whole purchase just $455 (with shipping) for an awesome laptop.