Noise Dampeners - Do they really work?

So my computer is a little noisy (not that it bothers me a whole lot) but any little bit helps.

I was looking at a few products and I was wondering if they really work.

http://www.xoxide.com/thermaltake-sound-dampening.html

http://www.xoxide.com/sharkoon-pc- [...] g-kit.html

http://www.xoxide.com/nexus-disktw [...] black.html

Tell me what you think or if you have other suggestions. I'm also currently using 1 120mm fan and 3 80mm fan (part of the problem).

Edit:

Case: Praetorian - (PAC-T01-EK)
Case Fans: 3 Cooler Master 80mm - 2000rpm/24.4 dBA and in the rear I installed a 120mm -80mm case fan adapter so I'm running a 120mm in the rear.
PSU: Thermaltake 700W
CPU HSF: Zalman 9700 40c/60c
GPU HSF: Zalman (came with Gigabyte 7950GT) to lazy to check what model. Cant check temps (just reformated so not running Ntune)

I also having an Antec VGA blower, and I clean my computer pretty often. Its about 6 months old.

Alright... I edited my first post.

What kind of stuff are you using on your computer?

I wonder how well Dynamat will work.

Dynamat would probably work well. And for all you cheapos, carpet padding is also a good noise insulator, I used some when I installed some speakers in my car a while back and it worked like a charm, plus it was free.

Here's an easy, cheap way to identify the noisy parts on your PC:
- Get an old cardboard tube - like at the end of a paper towel roll.
- Open the side of your case.
- Start the PC.
- Put the tube to your ear and point it at different fans or portions of the PC. This will help you isolate the noisy culprits in your system. If you want to upgrade to some of the quietest 80mm fans then take a look at this article. You can also take a look at the reference/recommended list on that site for quiet PC parts: PSU, Fans, efficient HSFs, etc.

10 points.

*scurries off to try*

Gullible is in the the dictionary. Whatya talking about?

http://dictionary.reference.com/browse/gullible

You have no idea how long I have waited for someone to post that

I agree with what Mpilch said. Use bigger fans, and pay extra to get quieter ones if need be. Just make sure they have a high enough CFM. As for HDD's, make sure you've got them screwed down, along with any cages that you can. The easy latches for cages and drives usually don't hold the drives securely and they can rattle a bit. Making sure everything is tight and the case has it's PCI slot covers on and secure can help muffle sound as well. I think a lot of dampening devices do nothing, they might make a noise a bit duller, but it's still present.