NB-BlackSilent Fan X-2 80mm Ultra Quiet PC Cooling Fan - 1800 RPM, 3-Pin Connector, 18 dBA - Ideal for Gaming PCs, Workstations & Home Theater Systems

Second best fan I have used in any PC in relation with CFM in this price range. Over the years I have used many fans from many different companies and this one to me ranks number two for dB! I thought I would give this fan a try in a couple different builds and for the most part I am pretty happy with it and will probably use it again in other builds. If you want a quitter fan and don't mind spending a few dollars more look into Noctua fans. The NF-A8 is what I use but I don't like the aesthetics of the Noctua. It is a better fan overall and I use it in builds you can't see the fans. I gave this fan 5 stars because I couldn't give it 4.5 and it doesn't warrant only 4 stars. This will be my go to fan for cases where the fans are visible.