It says the fan speed range is from 1400 to 2000 rpm. But it is a 3 pin fan. Is the 2000 rpm point controlled on its own or what? I check with the program called speedfan and it does not go past 1442 rpm. Here is the link to the specs on the official kuhler page.
http://www.antec.com/Believe_it/product.php?id=Mjc2OA==&lan=us
http://www.antec.com/Believe_it/product.php?id=Mjc2OA==&lan=us