I bought a couple Zalman Ultra-Quiet CPU Coolers for my still-unfinished dual-processor system, discovered that I couldn't use them due to space issues with my MSI dual-core motherboard. So I put one on my old system. It's quieter than the stock Intel Pentium fan, but so is a coqui frog (Hawaii reference. Or, apparently, Puerto Rico. Coqui's are loud). I really think water cooling is in my future.