* Part 3: Test Results
Balance load test sum-up (PF value under 230Vac)
Efficiency: 13.73 (full mark: 15)
Under the condition of 230Vac, Its 30W efficiency started from 79%, increased to 85% at 50W, and reached 91.27% at 100W. The peak efficiency was 94.72% at 350W, and full-load efficiency was 93.39%.
80Plus Certification Validation
SAMA Titanium 800W scored 92.1555%, 94.488%, 94.452% and 91.7% with 10%, 20%, 50% and 100% load, which is even higher than what the 80Plus Titanium standard: 90%, 92%, 94% and 90%.
According to Intel’s ATX12V 2.31 standard, the 5Vsb efficiency should be higher than 50%, 60% and 70% under the load of 100mA/250mA/1A respectively, while the idle power consumption is less than 1W.
5Vsb power consumption and efficiency
5Vsb voltage – The ideal value should be within ±5% (5.25V-4.75V), which means SAMA Titanium 800W shows great voltage control.
Voltage stability: 12.12 (full mark: 15)
The voltage deviate of 12V/5V/3.3V is 0.67%/1.7%/0.82%, and loading regulation is 0.94%/0.5%/1.12%, which is impressive as well.
Ripple & noise test: 12.13 (full mark: 15)
There are 2 shots of ripple, one is frequency under loads, the another one is PSU’s switchers frequency equivalent to high frequency. I have Vp-p of noise as the scoring benchmark of low frequency (10ms/div), While I have ripple shape for high frequency (10μs/div) When we narrow down to 10ms, we could see more details of DC performance under low frequency. Especially to 100HZ.
Cross loading test: 8.8 (full mark: 10)
We made a 850W cross loading diagram according to Intel ATX12V 2.3 and SSI EPS12V 2.92, and chose four test points of valuable reference listed as below:
Point A: minimum load of the whole system;
Point B: maximum load of 5V & 3.3V, minimum load of 12V, for example: when multiple HDDs start simultaneously;
Point C: maximum load of 5V & 3.3V, full-load of whole system;
Point D: maximum load of 12V, minimum load of 5V & 3.3V, for example: when you use a single SSD to run 3D games.
The X-coordinates of above points stand for overall +12V output efficiency, and the Y-coordinates stand for the sum of +5V and +3.3V output efficiency.
With the same judgement standard as balance load test, the less the voltage deviates from rated value, the better. ±5% ratio of deviation is allowed except for -12V.
Hold-up time test: 2.61 (full mark: 5)
Hold-up time represents the amount of time, usually measured in milliseconds, that a PSU can maintain output regulations as defined by the ATX specification without input power. Put simply, hold-up time is the amount of time that the system can continue to run without shutting down or rebooting during a power interruption. It’s highly concerned it usually decides the lifetime of hardware.
The SSI EPS12V 2.92 specification sets the minimum hold-up time of output voltage to 18ms while 75% loaded and that of Power-OK to 17ms.
The hold-up time of SAMA Titanium 800W was tested while 75% loaded (DC output: 600W).
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