If you are looking to make a silent PC getting rid of the CPU fan is a big step forward. Have a look at this Ion Cooler CPU Heat Sink for some ideas.

“After tinkering around one afternoon I came up with the concept for this little project. I have personally been using this in a specialized system I have for over 2 months now and haven’t had a single problem with it. The other added bonus with this system is its really easy to clean the grounding plates as opposed to other versions we had put together.

Now we swapped out our ion wind generator. As you can see if we used this heat sink in an actual pc we would turn the heat sink around so we were venting through the back of the case. The system idled at about 34C and we peaked at 48C as was confirmed by our IR heat reading gun. While these are warmer than say a gaming enthusiast would prefer this falls well within the standard users system needs.”