Hydra 120mm 4200rpm High Speed High Pressure Fan for GPU Servers, with 4-pin Molex Connector, 3 Pack

Amazing fans. High amount of air output, just comes at the price of noise. I have 6 on a rig in my basement covered up & I can still hear them upstairs. But they move so much air I don't care.FYI these are heavier duty than a normal PC case fan obviously, and spinning at 4200rpm makes for a very powerful finger chopper. However I accidentally jammed my finger (HARD) and it broke two blades off while they were at full tilt. And they aren't flimsy plastic blades. Ouch. Learn from my mistake.

This PC has over 480mm of liquid cooling radiator surface. 3 of these fans cool just the GPU radiators (2). Normal high pressure 7 volt fans were not moving enough air. Brilliant idea, server fans should do it. The idea worked perfectly other than being so loud at full power the playroom sounded like an mining farm. Solution 12 volt motor throttles. A little custom wiring and 3 custom speed controllers, wham dail in the GPU temperature you want. If you need to move some air these fans can handle it.

These are easily the best fans I’ve ever used, and I now use them exclusively for all my GPU rig builds. They are quality built, have amazing static pressure, and move enormous amounts of air. Even so, they are (relatively) quiet at around 57 dB. Not quiet enough for your living room... but a lot less obnoxious than the screeching of an Antminer.In my opinion, there is no better fan at this price point.

Not only will you spend money for the fans but also have to spend more money on some sort of controller and or external source of energy. Or get atx adapter and plug straight to it that way.

I tossed three of these fans in a server. When running separately the fans work as expected. When all three of them are running in the same box, well it sounds and feels very much like the garbage disposal in my sink. The whole table vibrates. I'm pretty sure there's some kind of harmonic frequency going on here, it's pretty insane. The vibration builds over time. In about four minutes it's reached it's peak. I'm going to have to replace at least two of the fans with something else.

Big and loud, but sucks air like a run away vacuum cleaner on steroids.As long as you know what you're getting into as far as noise level, you won't be disappointed by the performance of these fans.A decent speed controller can make the noise level a little more bearable if you use these in an environment where you want to adjust the fan rpm as needed.

Crazy powerful... actually used two of these for my mini camper. I built a window plate to use them as ventilation fans and these things are unbelievable. Feels like a breeze going through the trailer.

These fans are pretty loud, but are a good upgrade from the masscool 120mm fans. The high static pressure allowed me to remove 4 fans from my mining rig, reducing power draw by at least 40 watts and dropped the temperature of my GPUs by 15-20*C.