Summary: Great 80mm fan from Zalman. I like the customization of the speeds to tailor the needs of the system. The silent mode is good, but will move less air. Normal is decent, but introduces more noise. Quality fan from the zalman guys.
Summary: This fans comes with a small 3-to-3 pin adapter that lowers the fan speed, making it inaudible. Without it, the fan is still quiet, but not the best. The idea is cool, but very inconvenient. The fan cools just as well as my 80MM Sunon case fan, so that's good. In all, a good, quiet, fan that stays true to the Zalman name.
Summary: This case fan is ideal for those who don't like the excess noise only when it is truly not necessary. It has an adaptor that enables a silence while keeping decent airflow, therefore allowing you to choose from performance or silence.
Summary: This is a great case fan with stock appearance. Speed adjustment via motherboard controller is nice as it speeds up the fan when components are heating up. On the low end, 20db is awesome. The high end is a bit rough though.