both those techniques will reduce noise a little...
the sound material will probably work better than the washers, but both in conjunction will be pretty good.
you also might look into running the fans at 7 volts instead of 12.
to do this, you hook the fan up to the red and the yellow wire.
there are posts in here about how to do it...it is pretty simple, and should drop the fan noise by half...without damaging the fan. :smile:
<b><font color=blue>~ Whew! Finished...Now all I need is a Cyrix badge ~ </font color=blue> :wink: </b>
I have an Antec sx1030 case and with 5 80mm case fans and a heatsink fan, the case is very loud. I searched the web for ideas on how to decrease the noise produced and I found 2 ideas that really interested me. http://www.monster-hardware.com/soundproofyourcomputer 1.htm had an article about spraying the sides of your case with rubberized undercoating. And http://overclockers.com/tips635/ had an article about fixing mousepads to the panels of your computer to decrease vibrations.
I sprayed 3 layers of rubberized undercoating on the side panels. The panels are noticeably heavier and make a dull thud noise when tapped as opposed to clanging noise they used to make. I bought 5 mousepads and spray glue mounted them to the top, bottom and the area next to my ATX motherboard. I also put rubber grommets between my heatsink and fan. That eliminated a whine that was produced even thought the fan was tightly screwed to the heatsink.
After performing both of these I noticed a great reduction in sound. The higher frequencies have been eliminated and all I can hear now is the sound of airflow. I was worried that my system temperatures would increase, but they haven't. I recommend both of these ideas to anyone wanting to cut the noise on their computer. My next move is going to replace all the 80mm fans with panaflos and install a 120mm blowhole or two. I hope this helps!
Lian_le cases are built with guys (and gals) who build computers in mind. They're light weight (important for hauling to LAN parties) great airflow via 3 case fans that are included - the front two are speed variable. All thumbscrews. The front bay covers now don't even require screws - they pop into place. One of my favorites though is the case button disconnect. This allows you to plug in the power switch, etc into the pins on the mobo with the mobo/shelf assembly completely out of the case. This is sooooo nice!!
If you gonna do any upgrades or if you dig around in you case quite a bit, this is the case for you. I love mine...