My PC have never been silent enough, but since installing 4 SCSI disks it became too loud. Luckily, there was storage room behind my hometheater screen, so, after some thinking and studying prices of SSD drives (the best one at the moment are from Mtron, 800 EUR gives you 16GB of lightning fast (120 Read, 100 Write MB/s)), I decided that it is cheaper and easier to go the low tech way, i.e. drill a hole in a wall for power, HDMI and some USB cables and move PC to a room where it will not be heard, no matter how loud it is.
First, power cable went through the wall.
Then, all the rest -video connection, ethernet, printer and 2 USB extenders for wireless Logitech mouse and keyboard.
After connecting all cables, turning PC on, booting Vista and testing that everything works, it is time to put my bike where it used to be in the storage room.
Now, back to enjoying a totally silent and wireless setup of my home-theater / gaming rig.
And last thing, now I do not use "shut down" option when I want to switch off my computer. I use "sleep" only. To Microsoft's credit, there is an option, to wake up the system with USB mouse or keyboard. And it works flawlessly even with wireless keyboard. Voila! No need to go to the server room to push that button.