Cute fan, but clacking that bothers!

Never imagined the fan at Amazon bought for my Corsair H100 Wakü, first I tried the Enermax Magma, but they were a little too loud.
Then I have the Scythe Slip Stream PWM ordered on Amazon, because they were reasonably priced and in the end I can prop. Only say that it was from bad to worse.
The Enermax Magma were quite loud through the fan, but had a smooth run. The Scythe are rather quiet from the fans here, but have a slight clicking sound when
turn.

For big tower case fans as you can you think I use without problems, but I have a small BitFenix ​​Prodigy assembled standing on the table or in
near the ears and it bothers already a "little". The cooling capacity ansich is good and for the price you do ansich nothing wrong even though I'll swap them probably sometime next to another set, possibly. Noiseblocker ..