Just swapped my Thermaltake blue LED Rear Fan (standard on the Thermaltake Shark) with an akasa amber blade 120mm quiet fan
... the difference in noise is unbelievable....my thermaltake blue fan sounded like a hurricane.... this Akasa is keeping my CPU cooler than my Thermaltake Fan and its about half as loud.
Time to buy a Noctua 120 Ultra Quiet 1200Rpm for the front, and then a Kama-Bay with another Noctua 120 for the 5.25" drive bays 




