QUOTE
512 MB
There are a few situations where having just 512 MB system memory in your computer can be enough.
• If you run your games at low quality settings (small texture size) because you have an outdated CPU and graphics card, or because you prefer FPS over visual quality.
• If you only use one application at a time.
• If it is your grandmother's computer.
http://www.tomshardware.com/2005/12...eed/page12.html