Noctua NH-D14 CPU Cooler
 

A huge computer chassis deserves a huge CPU cooler, and when you need one of those, Noctua delivers. With its NH-D14, the company seems to have had the goal of delivering the largest cooler possible that could still fit on most ATX motherboards, but with that size comes extremely good performance even low noise levels.
http://techgage.com/article/noctua_nh-d14_cpu_cooler/