Summary: I tried out 2 different 80mm fans before I bought this one for my media center. I started with a fan from an old Dell, a 100mm that turned out to be quieter than the "silent" 80mm fans. The 120mm has a lower speed that probably helps with the noise. The noise difference is amazing. I guess large and slow is better than small and fast when it comes to noise. The 2 80mm fans I tried were the Stealth and the Cooler Master. Of those 2, the Stealth was the quieter one.
Summary: I replaced an aging 120mm fan with the Scythe S-Flex and am loving it. Where my case used to hum like a lawnmower, it's almost inaudible now, yet I have not measured any significant changes in operating temps. I am a believer in the importance of managed airflow in a case - move the air in through the front, out the back and make sure that your wires, ribbon cables, etc, are not blocking airflow and that your case is not filled with dust or pushed right against a wall.
Summary: The manufacturer of this fan claims it puts out 33.5 CFM at 8.7 dBA. When I ran the fan unmounted (no air flow restrictions or vibration points), the air flow on my hand was noticeably less than either of the two fans on my Antec Two Hundred case (120mm rated at 30.1 CFM at 900 rpm, which is low speed and 140mm rated at 33.6 CFM at 800 rpm, also low speed).
Summary: Very, Very quiet. In fact the quietest case fan I have ever used. EVER!!! There is no audible noise when it is on. It may not push a lot of air so if cooling is a priority you may want to choose a different fan. I am not a serious gamer. I use my computer for video applications so noise, or the lack of it, was a major priority for me. After experiencing this fan I might just replace my other 2 - 120mm fans with this one.
Summary: I'm very sensitive to noisy fans, so this 800rpm Scythe fan is my favorite so far. I use it to replace the noisy 3-speed fans in Antec cases. No clicks or noise of any kind from this fan; only the sound of a small amount of moving air. To make up for the small amount of air movement, I use a huge fanless heat sink on the CPU (Scythe Ninja is expensive but good).
Summary: I have had two of these in a Cooler Master Centurion Minitower for about 6 months now. For the last few months, the Scythe I have on my CPU heatsink has failed to start on bootup. It starts to spin, but ends up simply stopping. A quick spin with the finger gets it going, but who wants to open their case every time they turn their computer on? This fan has an extremely high startup voltage (8.9v!), which I think is the problem.
Summary: I use two of these fans in an Antec SLK3000B. The computer utilizes a 2.4GHz Celeron CPU and functions as an audio jukebox of music stored on 3 hard drives. These fans move enough air for this purpose. I can barely hear these fans from 5 feet away.
Scythe S-FLEX SFF21D: Some of the best 120mm fans around!
12 October 2009
Summary: Scythe S-Flex Fans are brilliant. If you want to upgrade the cooling in your tower or your CPU you would be hard pressed to find better made fans. These bad boys have S-FDB (SONY Fluid Dynamic Bearing) manufactured by SONY corporation. Which means they run very quiet. The S-FDB carries a surface contact mechanism for improved anti-shock structure, which is apparently fives times stronger than a conventional ball bearing.