You can have either high speed or near-silent running, but not both. What you need is a very efficient fan; look for a good CFM rating (Cubic feat per minute is a standard airflow measurement). The larger the better, and couple it with a variable resistor. click hereclick hereclick here
Hi winfast. For keeping the CPU cool, you need a lot of air through the heatsink cooling fins. To do this, without resorting to exotic liquid cooling, you need a small diameter fan spinning very fast, or you can have a large diameter fan spinning more slowly, and therefore more quietly. I am using this heatsink with a large diameter fan and am very pleased with it click here. I'm sure that more expensive coolers are available that use the same principle.