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Test Setup, Hold-Up Time, Inrush Current, Peak Load, And Short Circuit Protection Test

Silent Running: Two Fanless Power Supplies And A Quiet One, Tested
By
Test Hardware
AC SourceChroma Programmable AC Source 6530
Power MeterYokogawa WT210 Digital Power Meter
Loads4 x 600 W Chroma 63306 for 12 V testing
4 x 300 W Chroma 63303 for 5 and 3.3 V testing
using Chroma HighSpeed- DC Load Mainframes 6334
OscilloscopeTektronix DPO3034 Digital Phosphor Oscilloscope (300 MHz)
Test Procedure
Voltages110 and 230 V
Standby Power0.25 A fixed current to simulate PC standby power on 5 Vsb
80 PLUS Efficiency Testing100/50/20% load, relative to specified total output
Load distribution across 12/5/3.3 V rails at the same proportion as specified for 100%
testing at 110 V according to ATX 2.3 specification
Efficiency at Fixed Loads25, 50, 85, 300, 500 W loads
Load distribution across 12/5/3.3 V rails at the same proportion as specified for 100%
Peak Load Test110% Overload Testing at maximum combined 12 V
Temperature TestAir intake vs. Outtake temperature delta
tracking highest delta during all tests

For more test data about these three and other power supplies, please refer to our power supply charts.

Hold-Up Time, Inrush Current, Peak Load Test, and Short Circuit Protection Test

Short Circuit Protection Test at 12 V
Power Supply / Mains Voltage
Test Passed
Seasonic X-460 (115 V)Yes
Seasonic X-460 (230 V)Yes
be quiet! Straight Power E9 CM 480 W (115 V)Yes
be quiet! Straight Power E9 CM 480 W (230 V)Yes
SilverStone SST-ST50NF (115 V)Yes
SilverStone SST-ST50NF (230 V)Yes
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Top Comments
  • 20 Hide
    s3anister , July 20, 2012 5:55 AM
    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 experience

    Last time I checked, Americans aren't the only ones who enjoy a silent computing experience...
  • 17 Hide
    amuffin , July 20, 2012 6:02 AM
    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 experience

    Many companies that are focused on silence such as Noctua and beQuiet! are not "American."
Other Comments
  • 3 Hide
    amuffin , July 20, 2012 4:41 AM
    Seasonic, me gusta :) 
  • 7 Hide
    the1kingbob , July 20, 2012 5:50 AM
    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.
  • 20 Hide
    s3anister , July 20, 2012 5:55 AM
    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 experience

    Last time I checked, Americans aren't the only ones who enjoy a silent computing experience...
  • 17 Hide
    amuffin , July 20, 2012 6:02 AM
    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 experience

    Many companies that are focused on silence such as Noctua and beQuiet! are not "American."
  • 0 Hide
    Deemo13 , July 20, 2012 6:24 AM
    I didn't know they made fanless power supplies....cool beans.
  • 4 Hide
    uruquiora , July 20, 2012 6:34 AM
    Seasonic for the win :) 
  • 4 Hide
    mesab66 , July 20, 2012 7:14 AM
    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.
  • 1 Hide
    mitko , July 20, 2012 7:58 AM
    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 :) 
  • 9 Hide
    belardo , July 20, 2012 8:56 AM
    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.
  • 0 Hide
    jassenjj , July 20, 2012 8:58 AM
    There are some things to consider with fanless PSUs:
    1. The heat stress is the factor No. 1 for the lifespan of the capacitors, no matter if they are conductive polymer or very high quality electrolytic brand.
    2. The case should use more higher intake flow to make sure that the power supply's heat does not enter the case.
    3. A noise level of 10-13 dB can be tolerated for the sake of sustainability and avoiding the risk of heating up your case with the heat from from the PSU.

    Personally, in the last 10 years I admire Seasonic for their stile... But I would use a passive solution that is still in the PC case just for a while.
  • 2 Hide
    razor512 , July 20, 2012 10:06 AM
    the main difference with a silent PSU is the capacitor rating. Most noise ones use 1000 hour 105C capacitors, while a high end silent one will use caps that are in the range of 10,000 hour 105c, or even 125c

    most of the voltage regulators are mostly the same though they may add a larger heatsink on them.

    you could pretty much turn a standard PSU into a silent one by swapping the caps and heatsinks. High quality capacitors are about 3-5 times more expensive (may take the cost of a single cap from 5 cents, to around 15-20 cents)
  • 2 Hide
    waxdart , July 20, 2012 10:16 AM
    razor512the main difference with a silent PSU is the capacitor rating. Most noise ones use 1000 hour 105C capacitors, while a high end silent one will use caps that are in the range of 10,000 hour 105c, or even 125cmost of the voltage regulators are mostly the same though they may add a larger heatsink on them.you could pretty much turn a standard PSU into a silent one by swapping the caps and heatsinks. High quality capacitors are about 3-5 times more expensive (may take the cost of a single cap from 5 cents, to around 15-20 cents)


    Yeap, and you get a better, more reliable, energy efficient bit of kit too. Bit I don't think I'll be having a go a swapping them :) 
  • 3 Hide
    freggo , July 20, 2012 11:52 AM
    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 experience


    Not an 'American' thing, but a medical one. Noise pollution is becoming more and more of a problem; and affects long term hearing quality.
    No wonder people can no longer hear the difference between an MP3 and a CD recording.
  • 3 Hide
    willard , July 20, 2012 12:07 PM
    Seasonic's X series units are pretty damn good. I've got the X650, and its fan doesn't even turn on until you apply a substantial load to the unit. Even then, it's still inaudible over the other noise in my case.

    Every now and then you can find it on sale for $120. A steal for the best 650W PSU in the world.
  • 0 Hide
    Anonymous , July 20, 2012 2:22 PM
    I've been using a fanless psu in my HTPC for a few years now. A computer in the living room has different noise thresholds from a gaming PC.
  • 0 Hide
    vmem , July 20, 2012 2:31 PM
    I ordered the seasonic just last night, needless to say, this article makes me feel very good about my purchase decision :) 

    it'll be used in an HTPC/home media server. to those that have doubts about the usefulness of such a PSU, I will ask: "what's the point of having that nice audio system in your living room if all you're gonna hear is fan noise in the background?"
  • 0 Hide
    jupiter optimus maximus , July 20, 2012 3:37 PM
    I kinda wanted to see the KingWin 500W Stryker being compared to other fan-less units. Since it has 42 amps and it is platinum rated, it should be the best silent PSU in the market.
  • 0 Hide
    majorlag , July 20, 2012 5:54 PM
    I am currently using the Seasonic x400 fanless in my silent fanless HTPC system. And a x560 in my desktop build. One of the best power supply brands I have ever used. Currently my pick for new systems being built.

    Another article is what got me hooked http://www.silentpcreview.com/Seasonic_X-400_Fanless_PSU, they basically had to resort to a hair dryer to make the thermal protection trip. A very good power supply that can put up with alot of heat before having to shut down.
  • -4 Hide
    nebun , July 20, 2012 6:09 PM
    amuffinSeasonic, me gusta

    translate please...don't understand...thanks in advance
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