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Home > Hardware Reviews > PC Parts

Tuesday, November 06, 2012
PC POWER COOLING Silencer MKIII 1200W review

4. Measurements

For this test we monitored each of the rails of the PSU under various loads, which represent different power-hungry PC configurations. We took voltage measurements for 200W, 500W 800 W, 1000W and finally 1200W loads, which are close to the power requirements of a typical gaming system equipped with a single graphics card, an SLI/Xfire configuration, a high-end system with triple or quad SLI/Xfire configuration, and finally overclocked high-end system.

The current ATX specifications allow for the following fluctuations in voltage outputs:

  • 3.3V Rail: 3.135V - 3.465V
  • 5V Rail: 4.75V – 5.25V
  • 12V Rail: 11.4V – 12.6V

An oscilloscope was also used to examining the voltage ripple on the rails using the proper capacitors in place to filter noise. This measures how clean the power delivery really is for the tested power supply. The ATX specifications' requirement for ripple is 120 mV for 12V. The results is illustrated below:

Voltage regulation
Efficiency
Ripple
LOAD
3.3V
5V
12V
3.3V
5V
12V
200W
3.34
5.13
12.18
90.15%
6.2mV
10.1mV
8mV
500W
3.30
5.08
12.12
92.9%
10.2mV
14.6mV
13.3mV
800W
3.27
5.04
12.09
91.6%
12.1mV
16.3mV
14.3mV
1000W
3.24
5.01
12.07
90.36%
18.9mV
17.1mV
17.5mV
1200W
3.21
4.98
11.81
90.4%
14.3mV
19.9mV
25.1mV

 

Starting with the voltage measurements on the PSU's rails, the voltage deviation for the 12V rail is around 2.3% .

The 5V rail stayed within 3% voltage regulation. Finally for the 3.3V rail, regulation was within 4%.

Ripple results were great, with ripple at +12V rail never exceeding 30 mV. In addition, ripple on the minor rails is even smaller and almost half of the limit.

DC output quality was generally high, with any noise at the signal to gradually increase as the loads also increased. Under the demanding 1200W load, the noise on the 12V rail was just 25.1mV.

Efficiency was also high for all the loads and of course, higher than 80% in order to comply with the 80 Plus standard.

Regarding noise levels, we measured any audible sound from a 1m distance from the PSU. The fan was silent until the 600W loads. A very low 28dB(a) was measured after the 740W point and reached the 38dB(A) under full load, which is very low.




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