NoctuaNF-A14x25 G2 PWM, Premium-Quality Quiet 140mm PC Fan, 4-pin (Brown)

If your application calls for either 120mm or 140mm, get a 140mm fan - a "big fan slow" moves as much air as as a "small fan fast" at a lower volume. Noctua takes that up to 11.These are so quiet that I thought at first I forgot to plug them in. They are effectively silent up to 60%, at which point they become barely audible - and a sort of low, pleasing "hum" rather then a shrill "whir".They have no problem moving large volumes of air. The included accessories are top-notch: the Y-cable, fan extension, radiator gasket, anti-noise pulls, etc. are all top-tier and included in the box.You'll have to pry these fans away from me!Edit: my PSU fan was getting a little noisy - Noctua to the rescue! So much quieter, for only a small amount of effort.

I literally cannot give these fans enough praise. Noctua took the world's best computer fan and actually managed to make it better. I have 8 G2 140 fans inside my workstation and it is almost silent at full tilt. The Gen 2's move more air than the Gen 1's while being quieter. Frankly, it's a miracle.

These are probably the highest quality and most efficient fans you can buy. They move a ton of air under load, and when not unde load they're basically silent.

These will blow you away, silently.

Expensive 140mm fan but the quality is there. I used to use NZXT rgb fans but grew out of the rgb hype and going solely for silent gaming and this is it. Officially converted to a Noctua user for future builds.

I hear absolutely nothing from these fans. I finally have a truly silent computer. Noctua is worth every penny.

Fan quality is excellent, easy to install. So quiet I can’t even tell they are spinning and boy they move so much air I was baffled. 10/10 would recommend.

1 of 2 Noctua NF-A14x25 G2 I ordered had a faint crackling noise at 900 RPM (roughly 60% PWM). Ended up ordering a new one and it didn't have this issue. Fan is good but questionable QC for Noctua's new product line up. I got about a 3C drop compared to the old 140MM model at the same RPM.