I'm planning on buying a NZXT Kraken x41 and I would like to get the most performance out of my cooling system by getting a better fan. I was thinking on buying a Noctua NF - A14 PWM, but I just don't know if that fan would be appropriate for the 140mm radiator. Also the Noctua fans have a 50% discount on amazon.
http://www.amazon.com/gp/aw/d/B00CP6QLY6/ref=mp_s_a_1_1?qid=1405479055&sr=8-1&pi=SY200_QL40
http://www.amazon.com/gp/aw/d/B00CP6QLY6/ref=mp_s_a_1_1?qid=1405479055&sr=8-1&pi=SY200_QL40