Output Noise & Fan(s) Speed
Noise Level @ 40%-100% of Max Speed
The pair of fans is noisy even at low speeds. This is why most brands avoid ball-bearing fans and go with rifle or fluid-dynamic bearing fans. That said, DBB fans are generally considered better than FDB ones, not because they are better by design, but mainly because of the cheap FDB fans that exist today in the market, which can leak or dry out. In general, FDB fans are sensitive to poor oil sealing and are not suitable for operation at high temperatures, while DBB have very high temperature tolerance (70–90 °C continuous).
What you should know is that a proper FDB is the best bearing ever invented for consumer fans. But if you plan on keeping the fan operating above 50°C, you should consider a DBB fan. That’s why server PSUs typically use DBB fans. Tolerance to high operating temperatures and no noise sensitivity issues, because servers are typically loud machines!
PWM Level @ Noise & RPM
Noise Level @ Fan Speed
The higher the RPM in these charts, the better.
