Review on ARCTIC F9 (5 Pack) - 92mm Black Standard Case Fans: Quiet Motor, High Fan Speed, Push/Pull Configuration for Effective Cooling by Kenta Kajikawa ᠌

For the price, I would give more than five stars. In the middle of the last decade, Glacial tech had inexpensive and at the same time good fans with two ball bearings (they are still plowing), but then this company went berserk. :( Now I switched to AC (I have one for 92 mm and two for 12). Pros: - at this price, there are no competitors at a distance of a cannon shot - quiet up to 800 rpm (F12 also has a mark at this speed) - 9 blades (high pressure) - 4 screws included - 6 years warranty - hydrodynamic bearing Some cons: crackling is heard from a SMALL distance (most likely electrical)