FSP Green PS FSP400-60GLN 400W PSU

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MP3 Sound Recordings of FSP Green PS FSP400-60GLN

FSP Green PS 400 @ 40W (24 [email protected])

FSP Green PS 400 @ 65W (25 [email protected])

FSP Green PS 400 @ 90W (26 [email protected])

FSP Green PS 400 @ 150W (29 [email protected])

There was no need to make recordings at higher power levels; it's simply too loud.
Sound Recordings of PSU Comparatives

Seasonic Tornado 400 @ 65W (19 dBA/1m)

Seasonic S12-430 @ 150W (19 dBA/1m)

Antec Neo HE 430 @ 150W (21 [email protected])

Antec Neo HE 430 @ 200W (26 [email protected])

Enermax Noisetaker 600W (2.0) @ 150W (27 dBA/1m)


These recordings were made with a high resolution studio quality digital recording system. The microphone was 3" from the edge of the fan frame at a 45° angle, facing the intake side of the fan to avoid direct wind noise. The ambient noise during all recordings was 18 dBA or lower.

To set the volume to a realistic level (similar to the original), try playing the Nexus 92 fan reference recording and setting the volume so that it is barely audible. Then don't reset the volume and play the other sound files. Of course, tone controls or other effects should all be turned off or set to neutral. For full details on how to calibrate your sound system to get the most valid listening comparison, please see the yellow text box entitled Listen to the Fans on page four of the article SPCR's Test / Sound Lab: A Short Tour.


In spite of its scrawny, unpolished looks, there is substance to the FSP Green PS. At the moment, the Green PS is a bit of a novelty, but once the RoHS legislation in the EU takes full effect we can expect to see many more environmentally friendly power supplies. FSP deserves credit for being first at the gate, and there seems to be a serious power supply underneath the lead-free, recyclable marketing.

In terms of electrical output, the Green PS is solid. Its voltage rails were rock steady in our testing, and it has high efficiency. The high specified operating temperature should mean that performance will remain solid even under less favorable circumstances.

The noise performance is above average, but two factors hold it back:

  1. High airflow creates a lot of broadband turbulence noise.
  2. The fan controller doesn't have a threshold where it stays put, but remains responsive throughout its output range.

Changes in fan speed are gradual and barely noticeable, and if the output is stable, the fan speed will also be stable. But compared to the best fan-cooled PSUs, changes in load have a higher chance of leading to audible changes in fan speed.

Despite the thermal measurements, the internal cooling is still a bit of a mystery. The miniature heatsinks and electrical components don't seem to suffer from their small size, but it's still difficult to know just how well cooled they are. All we can really say for sure is that the thermal rise through the unit is about average among SPCR-tested PSUs. (Editor's Note: The minimalist, cost-effective approach manifested in the FSP Green PS is reminiscent of Arctic Cooling's approach with low-cost heatsink-fans, which I've often admired for their efficient engineering.)

The Green PS offers very good electrical performance, decent acoustics, and some eccentricities: The small components and its environmentally friendly construction can't be found anywhere else. As I said at the beginning, this is a nerdy power supply: It looks quite unremarkable, but is impossible to fully understand.

NOTE: In North America, the FSP Green PS appears to be stocked only by the online retailer Newegg at this time (Nov. 7, 2005). There are a few more stores that offer it in the EU.

Much thanks to FSP Group for the opportunity to examine this power supply.

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