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Silent Running: Two Fanless Power Supplies And A Quiet One, Tested

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The power supply typically isn't the noisiest component in a high-end PC. Nevertheless, many folks are serious about cutting noise, and go the extra mile for a quiet system. We step in with a comparison of two silent models against one low-noise PSU.

Seasonic X-460 460 W

Seasonic's X-460 is also adorned with the coveted 80 PLUS Gold logo. Rated for 460 W, the X-460 comes close to the be quiet! unit's output. However, Seasonic does this without employing active cooling (a fact that is advertised in several places on the packaging).

The box also contains a leaflet that explains the peculiarities of a fanless supply. 

The X-460's feature set is typical for the $100+ price range. You get two PCIe connectors, as well as five SATA and five four-pin Molex connectors. Seasonic's X-series features fully modular cable management, which sets it apart from much of its competition. The cable lengths are sufficient, though they're a bit shorter than what you get from the other two power supplies in this round-up. The X-460 employs a single +12 V rail able to deliver up to 38 A.

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Seasonic X-460
AC Input100-240 V, 50-60 Hz
DC Output+3.3 V+5 V+12 V (#1)+12 V (#3)+12 V (#3)+12 V (#4)-12 V+5 Vsb
20 A20 A38 A0.5 A2.5 A
Individual Output6 W12.5 W
Rail UtilizationSysSysCPU And VGA
Combined Output100 W456 W
Total Continuous Output460 W
Peak Outputn/a
41 Comments Comment from the forums
  • amuffin 20 July 2012 11:41
    Seasonic, me gusta :)
    Reply
  • zeratul600 20 July 2012 12:12
    Why does americans are so picky about the noise rate??? i never stop to think about that! it has never become an obstacle to enjoy my pc experience
    Reply
  • the1kingbob 20 July 2012 12:50
    Fan noise has never bothered me much, which maybe why I own two 4870s... one of which has a jet plane I mean reference cooler on it..... sadly my wife doesn't care much for the noise, which lead me to buy her wireless headphones :)

    I think it is quite neat that they have fanless option. I would never take the risk, but if I did I would chose seasonic, my 750W has done me well.
    Reply
  • s3anister 20 July 2012 12:55
    zeratul600Why does americans are so picky about the noise rate??? i never stop to think about that! it has never become an obstacle to enjoy my pc experienceLast time I checked, Americans aren't the only ones who enjoy a silent computing experience...
    Reply
  • amuffin 20 July 2012 13:02
    zeratul600Why does americans are so picky about the noise rate??? i never stop to think about that! it has never become an obstacle to enjoy my pc experienceMany companies that are focused on silence such as Noctua and beQuiet! are not "American."
    Reply
  • Deemo13 20 July 2012 13:24
    I didn't know they made fanless power supplies....cool beans.
    Reply
  • uruquiora 20 July 2012 13:34
    Seasonic for the win :)
    Reply
  • mesab66 20 July 2012 14:14
    ZERTUL600......FOR THE VAST MAJORITY OF FOLKS, PERSISTANT/RELENTLESS NOISE QUICKLY BECOMES VERY ANNOYING!!..........give 100 folk a choice of 2 pc rooms - one near silent and one, noisy as hell. Riddle me this....how many go for the quiet room?
    --> argument over.
    Reply
  • mitko 20 July 2012 14:58
    A year ago I built a water cooled system with an i7 2600k and 2 x Radeon 6990. The whole point of the water cooling was to make things extra quiet, which it did, except for the power supply. I tried two different Corsair AX1200 units before switching to a Nexus RX1100. The power supply is still BY FAR the noisiest component in the computer. Does anyone have a suggestion how to reduce the noise? I could not find any currently manufactured water cooled PSUs. Do you think it is possible to use 2 low-noise PSUs to power components on the same motherboard? Any other ideas are also welcome. I need at least a 1100W PSU, as I've actually measured the power consumption to be 1067W at 100% CPU and GPU load.

    For the record I am not an American and I don't live in the US :)
    Reply
  • belardo 20 July 2012 15:56
    In a quality modern PSU... can anyone really hear the PSUs?

    I've been buying Corsair and even $45 Thermaltake 500... and I cannot hear them... with the cover open. The problems with FANLESS PSUs and GPUs is that they become heat-sinks... sure they are quiet, but everything around them gets warm. You need to blow the hot air out.

    Going from a fanless GPU to something with a huge fan (H.I.S. brand) - the fans barely makes noise and use a rear exhaust and I can run the system fans at a lower speed.


    Mitko: get soundproofing material, apply to inside of case. Put case on floor.

    My case is on the desk, a foot or so away from me... its no louder than the A/C vent blowing air in the room.
    Reply