Go to page:

Load Regulation, Hold-Up Time, And Inrush Current

To learn more about our PSU tests and methodology, please check out How We Test Power Supply Units.

SilverStone SX700-LPT

Lian Li PE-750

SilverStone SX600-G

Primary Rails And 5VSB Load Regulation

Load Regulation testing is detailed here.

Image 1 of 8

Image 2 of 8

Image 3 of 8

Image 4 of 8

Image 5 of 8

Image 6 of 8

Image 7 of 8

Image 8 of 8

Hold-Up Time

Our hold-up time tests are described in detail here.

Image 1 of 7

Image 2 of 7

Image 3 of 7

Image 4 of 7

Image 5 of 7

Image 6 of 7

Image 7 of 7

Besides a very low hold-up time result, we also stumble upon a false power-good signal. That's very disappointing.

Inrush Current

For details on our inrush current testing, please click here.

Image 1 of 2

Image 2 of 2

Observed inrush current is very high, especially with 115 V input.

Load Regulation And Efficiency Measurements

The first set of tests reveals the voltage rails' stability and SX700-LPT's efficiency. The applied load equals (approximately) 10 to 110 percent of the maximum load the supply can handle, 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 Haswell-ready 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	Fan Noise	Temps (In/Out)	PF/AC Volts
1	3.945A	1.974A	1.959A	0.989A	69.72	87.24%	0 RPM	0 dB(A)	50.54°C	0.972
1	12.205V	5.065V	3.367V	5.032V	79.92	87.24%	0 RPM	0 dB(A)	46.65°C	115.1V
2	8.924A	2.959A	2.940A	1.195A	139.68	90.71%	0 RPM	0 dB(A)	51.75°C	0.990
2	12.197V	5.054V	3.363V	5.017V	153.98	90.71%	0 RPM	0 dB(A)	47.51°C	115.1V
3	14.277A	3.474A	3.453A	1.400A	209.88	90.94%	1650 RPM	38.4 dB(A)	40.94°C	0.995
3	12.172V	5.042V	3.357V	4.998V	230.80	90.94%	1650 RPM	38.4 dB(A)	44.84°C	115.1V
4	19.625A	3.974A	3.936A	1.605A	279.75	91.48%	1660 RPM	38.5 dB(A)	41.48°C	0.997
4	12.156V	5.032V	3.352V	4.983V	305.79	91.48%	1660 RPM	38.5 dB(A)	45.79°C	115.1V
5	24.639A	4.978A	4.925A	1.809A	349.71	91.41%	1700 RPM	39.0 dB(A)	41.93°C	0.998
5	12.145V	5.019V	3.350V	4.968V	382.59	91.41%	1700 RPM	39.0 dB(A)	46.79°C	115.1V
6	29.673A	5.992A	5.914A	2.016A	419.62	91.05%	1770 RPM	39.6 dB(A)	42.88°C	0.998
6	12.127V	5.008V	3.346V	4.951V	460.88	91.05%	1770 RPM	39.6 dB(A)	48.14°C	115.1V
7	34.712A	7.011A	6.905A	2.225A	489.62	90.63%	1805 RPM	40.3 dB(A)	44.08°C	0.998
7	12.115V	4.994V	3.344V	4.936V	540.23	90.63%	1805 RPM	40.3 dB(A)	49.75°C	115.2V
8	39.770A	8.032A	7.896A	2.437A	559.56	90.07%	1860 RPM	41.3 dB(A)	44.26°C	0.999
8	12.099V	4.981V	3.342V	4.918V	621.22	90.07%	1860 RPM	41.3 dB(A)	50.33°C	115.2V
9	45.275A	8.550A	8.417A	2.440A	629.59	89.49%	1885 RPM	41.6 dB(A)	45.42°C	0.999
9	12.082V	4.970V	3.338V	4.911V	703.57	89.49%	1885 RPM	41.6 dB(A)	52.16°C	115.1V
10	50.537A	9.075A	8.911A	3.075A	699.49	88.78%	1885 RPM	41.6 dB(A)	45.57°C	0.999
10	12.066V	4.960V	3.333V	4.877V	787.91	88.78%	1885 RPM	41.6 dB(A)	53.08°C	115.1V
11	56.319A	9.087A	8.935A	3.078A	769.22	84.73%	1885 RPM	41.6 dB(A)	46.19°C	0.999
11	12.066V	4.951V	3.323V	4.870V	907.89	84.73%	1885 RPM	41.6 dB(A)	55.01°C	115.1V
CL1	0.101A	14.024A	14.005A	0.000A	118.84	82.80%	1885 RPM	41.6 dB(A)	45.95°C	0.990
CL1	12.182V	4.990V	3.401V	5.065V	143.53	82.80%	1885 RPM	41.6 dB(A)	53.90°C	115.2V
CL2	58.282A	1.003A	1.003A	1.002A	716.90	89.37%	1885 RPM	41.6 dB(A)	46.07°C	0.999
CL2	12.072V	5.008V	3.303V	4.973V	802.17	89.37%	1885 RPM	41.6 dB(A)	54.44°C	115.1V

Load regulation on the +12V rail is tight enough, although nowhere close to the performance of Corsair's SFX family or Lian Li's similar PE-750, which uses a platform provided by Enhance Electronics. The 5V rail demonstrates average load regulation, the 5VSB rail is pretty loose, and the 3.3V rail surprises us by registering the best load regulation among all competing units.

As far as efficiency goes, the 20% load requirement is met. SilverStone's SX700-LPT comes close enough to the mid- and full-load requirements to get a pass from us given our high-temp testing methodology.

The semi-passive mode looks like it works normally since, during the CL1 test when the load is low, the fan stays active and at full speed due to high temperatures inside the PSU. We certainly wouldn't call the fan quiet in that case; it starts at 1650 RPM. Of course, this has to do with the very tough conditions inside our hotbox.

Current page: Load Regulation, Hold-Up Time, And Inrush Current

Prev Page A Look Inside And Component Analysis Next Page Efficiency, Temperature, And Noise

4 Comments Comment from the forums

JQB45 27 October 2016 15:00

Overpriced
Reply
powernod 27 October 2016 15:56

Purely disappointing!!.
A permanent flaw (false power-good signal), combined with a periodical flaw (far out of specs ripple if this unit gets overloaded), are more than enough evidence in order for me to conclude that this PSU is a potential danger for the rest of the hardware!!.
Once more, thanks for the great review Aris!
Reply
basroil 28 October 2016 04:26

I looked at the internals first, and from that assumed this thing would be an utter mess. Surprisingly it's only a mess... If it was rated as a 550W unit I would have just said the holdup time was disappointing, but as a 700W rated unit this thing goes in the junk list.

And seriously, what were they thinking with that layout? One short and the thing will definitely fry and take down your circuit breaker with it. Considering the number of missed surface mount solder points, shorts are going to be likely.
Reply
gadgety 12 November 2016 11:30

Great review. Thank you.
Reply

SilverStone SFX Series SX700-LPT PSU Review

SilverStone released a powerful new SFX-L unit that boasts 700W capacity, Platinum-rated efficiency, fully modular cabling, and a single +12V rail. The SX700-LPT is based on a Sirfa platform and promises quiet operation thanks to its 120mm fan.