Sound dampening is a very
important part to creating a quiet PC. Sound dampening parts will help muffle
the sound of your computer to create a quieter and less stressful computing
environment. These can also help eliminate noise from your home theater PC (HTPC)
that can be distracting when watching movies and television. These products are
designed to minimize vibrating and resonating inside your case. For extremely
loud computer systems, fans and coolers will first need to be changed to get
dramatic differences. Sound dampening is usually best used for cases that have
already been modified with low noise fans and coolers.
Sound Dampening Material 
