Page 1:Features & Specifications
Page 2:Packaging, Contents, Exterior & Cabling
Page 3:Teardown & Component Analysis
Page 4:Load Regulation, Hold-Up Time & Inrush Current
Page 5:Efficiency, Temperature & Noise
Page 6:Protection Features
Page 7:Cross-Load Tests & Infrared Images
Page 8:Transient Response Tests
Page 9:Ripple Measurements
Page 10:EMC Pre-Compliance Testing
Page 11:Performance, Value, Noise & Efficiency
Page 12:Final Analysis
Load Regulation, Hold-Up Time & Inrush Current
To learn more about our PSU tests and methodology, please check out How We Test Power Supply Units.
Primary Rails And 5VSB Load Regulation
Load Regulation testing is detailed here.
Our hold-up time tests are described in detail here.
The hold-up time we measure is too low. Adding insult to injury, the power-good signal is inaccurate. This is unacceptable from any PSU, but especially one billed as high-end.
For details on our inrush current testing, please click here.
The inrush current is normal given this unit's capacity.
Load Regulation And Efficiency Measurements
The first set of tests reveals the stability of the voltage rails and the SX800-LTI's efficiency. The applied load equals (approximately) 10 to 110 percent of the PSU's maximum load in increments of 10 percentage points.
We conducted two additional tests. During the first, we stressed the two minor rails (5V and 3.3V) with a high load, while the load at +12V was only 0.1A. This test reveals whether a PSU is compatible with Intel's C6/C7 sleep states or not. In the second test, we determined the maximum load the +12V rail could handle with minimal load on the minor rails.
|Test #||12V||5V||3.3V||5VSB||DC/AC (Watts)||Efficiency||Fan Speed||PSU Noise||Temps (In/Out)||PF/AC Volts|
|1||4.822A||1.955A||1.982A||0.980A||79.741||90.530%||0 RPM||<6.0 dB(A)||42.05°C||0.959|
|2||10.676A||2.940A||2.985A||1.181A||159.655||93.304%||0 RPM||<6.0 dB(A)||42.61°C||0.980|
|3||16.900A||3.440A||3.504A||1.380A||239.850||93.231%||0 RPM||<6.0 dB(A)||42.93°C||0.987|
|4||23.111A||3.935A||3.998A||1.580A||319.715||93.023%||955 RPM||30.3 dB(A)||40.08°C||0.989|
|5||28.980A||4.932A||5.006A||1.784A||399.669||92.477%||990 RPM||30.6 dB(A)||40.86°C||0.991|
|6||34.851A||5.925A||6.023A||1.985A||479.601||90.676%||1780 RPM||42.0 dB(A)||41.63°C||0.992|
|7||40.731A||6.928A||7.045A||2.190A||559.596||89.835%||2080 RPM||46.2 dB(A)||42.68°C||0.994|
|8||46.625A||7.925A||8.069A||2.395A||639.529||89.093%||2170 RPM||47.5 dB(A)||43.19°C||0.995|
|9||52.954A||8.439A||8.603A||2.399A||719.617||88.286%||2220 RPM||47.6 dB(A)||43.85°C||0.996|
|10||59.222A||8.941A||9.112A||2.500A||799.409||87.563%||2230 RPM||47.6 dB(A)||45.60°C||0.996|
|11||65.896A||8.952A||9.127A||2.505A||879.344||86.806%||2230 RPM||47.6 dB(A)||46.16°C||0.997|
|CL1||0.098A||10.013A||10.005A||0.004A||85.316||88.365%||0 RPM||0 dB(A)||51.19°C||0.960|
|CL2||65.774A||1.003A||1.002A||1.002A||804.710||88.052%||2220 RPM||47.6 dB(A)||44.67°C||0.996|
Load regulation is tight on all rails (easily within the 3% region that SilverStone promises). The efficiency levels we observe are amazing under light and mid-range loads. However, under full load, the SX800-LTI lands well short of the 90% demanded by 80 PLUS' Titanium specification. Then again, we run our tests at temperatures much higher than the 23°C 80 PLUS uses for characterization.
The PSU's noise at up to typical loads is low enough. However, under 60% load (of its max-rated capacity), the fan is loud at 42 dB(A). Typically, larger fans spin at fewer rotations per minute to achieve the same airflow as smaller fans. Unfortunately, though, dense high-capacity PSUs generate heat that's difficult to exhaust. At a maximum speed of 2230 RPM, our equipment registers 47.6 dB(A).
MORE: Best Power Supplies
MORE: All Power Supply Content
- Features & Specifications
- Packaging, Contents, Exterior & Cabling
- Teardown & Component Analysis
- Load Regulation, Hold-Up Time & Inrush Current
- Efficiency, Temperature & Noise
- Protection Features
- Cross-Load Tests & Infrared Images
- Transient Response Tests
- Ripple Measurements
- EMC Pre-Compliance Testing
- Performance, Value, Noise & Efficiency
- Final Analysis