Seasonic SS-300SFD 80 Plus: Little Big PSU

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The unit opens up into two C-sections, roughly speaking. It's pretty tightly packed, and the staggered fin aluminum heatsinks seen in other Seasonic PSUs are also used here. Getting it open without causing any damage was a challenge.

A full house inside.

The fan is the same model used in some previous Seasonic power supplies. It is made by ADDA, a good brand. It is a sleeve bearing model rated at 0.25A at 12V. I could not find the sleeve bearing version at ADDA's web site, but the ball bearing version is rated for 38 CFM and 34 dBA (presumably at 1 meter). The sleeve bearing may be a bit quieter; it is usually smoother.

Innocuous 80mm sleeve bearing fan.

Because the space in this PSU is quite constricted, it's probably good or cooling that a relatively high speed fan is being used. Hopefully, at typical power loads, the fan controller will keep the speed and noise of the fan in check.


There are a total of five cable sets. They are all quite short, but as the PSU is meant to go into a small system, the lengths are probably about right.

  • 11" cable for main 24-pin ATX connector
  • 11" cable for 4-pin AUX12V connector
  • 15" cable with two SATA drive connectors
  • 2 x 18" cables with two 4-pin IDE drive connectors and one floppy connector

Short, plain cables: The ruler is just 18" long.

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