be quiet! PURE ROCK 2 Review @ Vortez
 

Bolted to the front, or rear, of the tower is a be quiet! Pure Wings 2 120mm PWM fan for quiet operation. be quiet! also bundle in a second set of fan mounts if you need to improve the cooling of the cooler for whatever reason. be quiet! reckon that their design also ensures excellent compatibility with even the tallest of DRAM modules for tight builds and small motherboards.

https://www.vortez.net/review.php?id=1758