Upon removal, the fan seems identical to the one from the previous model—but let's not be too quick to judge a fan by its cover.

Advanced Hydraulic Bearing

Hmm. Interesting. What exactly is Advanced Hydraulic Bearing? Let's find out. According to Asia Vital Components:

AHB "consists of a polished steel shaft, a sintered bearing and fluid lubricant." In this system there "is no contact between shaft and bearing" and thus "the bearing load is carried solely by a film of fluid lubricant."

AHB is best for fans that operate at a lower speed. It's better at absorbing shock and dampening vibration than traditional ball bearings, making for a quieter fan.