Voltage Regulation

+3.3V Regulation/Ripple and Noise
Load Voltage
10% +2,73% (4mV)
20% +2,12% (8mV)
50% +0,91% (12mV)
80% -0,91% (16mV)
100% -1,81% (19mV)
110% -2,42% (22mV)
Crossload +12V max. +1,51%
Crossload +3,3V/+5V max. +2,73%


+5V Regulation/Ripple and Noise
Load Voltage
10% +2,20% (7mV)
20% +1,80% V (11mV)
50% +1,80% (14mV)
80% +1,20% (15mV)
100% +1,20% (18mV)
110% +1,00% (20mV)
Crossload +12V max. +2,40%
Crossload +3,3V/+5V max. -5,20%


+12V Regulation (Worst Rail)/Ripple and Noise (Worst Rail)
Load Voltage
10% +0,92% (9mV)
20% +1,01% (18mV)
50% +0,42% (35mV)
80% -1,08% (43mV)
100% -1,25% (58mV)
110% -1,58% (63mV)
Crossload +12V max. -3,25%
Crossload +3,3V/+5V max. +9,83%

Noise Levels

Sound Pressure Level (Ambient: 16dBA, 1m distance)
Load dB(A)
10% 20
20% 20
50% 20
80% 26
100% 30
110% 32

Efficiency and PFC

115VAC, 60Hz
Load Efficiency PFC
10% 77% 0.944
20% 83% 0.957
50% 86% 0.972
80% 85% 0.981
100% 82% 0.987
110% 81% 0.991


230VAC, 50Hz
Load Efficiency PFC
10% 79% 0.822
20% 84% 0.940
50% 87% 0.970
80% 86% 0.978
100% 85% 0.986
110% 83% 0.988

The SilverStone Strider Plus 500W can deliver the specified power and even a bit more. The ripple and noise is low on all outputs, especially on +3.3V and +5V where less than 0.44% can be achieved. The efficiency is likewise well above the necessary values ​​for 80 Plus Bronze. Only the measurements at 10% load are low on both power grids. Of course, 77-79% efficiency at 50W means you're drawing 63-65W from the wall; improving efficiency to 83% would cut power use to 60W, so the potential savings aren't all that noteworthy. The power factor reaches a maximum of 0.991, again with rather low PFC at 10% load on 230VAC.

Under load the power supply is clearly audible, and fan speed starts to ramp up once you reach 50% load. However, there isn't any background noise from the electronics, which is good. During the crossload tests +5V and +12V were out of the ATX specification. During test 2 +5V was significantly increased by the regulation circuit (still far away from 5.00V), but +12V was raised too. However, this is not a problem that concerns SilverStone only. The forward converter with coupled outputs, as it is used in most power supplies, has complications with crossload tests. In the future we will see that many 80 Plus Gold power supplies are better--and not just because of the higher efficiency. This is the reason for our new test procedure.

Internal Design Conclusion


View All Comments

  • TegiriNenashi - Tuesday, October 11, 2011 - link

    I might need PS to build Ivy Bridge system next year, and 500 W PS is an overkill. What is that processor power envelope, like 50 W? Add 100 W for discrete videocard, 10 W for HD, and 10 W for MB (I'm generous in the latest two cases here). What is available in 300W range? Reply
  • iamkyle - Tuesday, October 11, 2011 - link

    ...another PSU I will never be able to compare against others.

    Seriously, look at all other Anandtech articles. Well written, plenty of comprehensive background to help the reader paint a better picture of the particular device, and plenty of data available to compare anything reviewed against it.

    Every single power supply review in recent memory has been absolutely absurd. I'm seriously tired of seeing bland reviews that really tell me nothing every time Anandtech gets a new unit. Why does a site such as this tolerate a clear lack of vision in this section of reviews?

    Before I get naysayers saying "well if you're so certain you could write a better one, then do it yourself" - DONE. Done and done. Anything to stem the tide of sub-par PSU reviewing.
  • AssBall - Tuesday, October 11, 2011 - link

    I recently got an Antec Basiq BP550 Plus for $60. It is 80 Plus and modular, and is nicely packaged. I don't know if Antec uses cheap components too, but I trust the brand. It seems pretty quiet and there's a three year warranty. It would be a good one to review, Martin, if you have the chance. Reply
  • Martin Kaffei - Monday, October 17, 2011 - link

    I asked for some cheap Antec PSUs, especially Earth Watts.
    In the end we got a HCP 750W...

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