Beware, these are not necessarily cheap but are also not that expensive if you compare them to other high end fans. The price might be a little bit steep but in my opinion they are worth every penny because you are getting a high quality product that performs just as you would expect and on top of that, you have a 6 year warranty. You know you are getting a high quality product when it has the Noctua name on the package. We strongly recommend the Noctua NF-A14 industrialPPC fans to anyone who's looking for the best of the best. Noctua continues to release high quality products so with all that being said, we are proud to give both the NF-A14 iPPC-3000 and 2000RPM PWM fans our Gold Award.

http://www.relaxedtech.com/reviews/noctua/...industrialppc/1