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XPG Pylon 650W Power Supply Review

A decent performance PSU with a good price.

XPG Pylon 650
(Image: © Tom's Hardware)

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

Primary Rails And 5VSB Load Regulation

The following charts show the main rails' voltage values recorded between a range of 40W up to the PSU's maximum specified load, along with the deviation (in percent). Tight regulation is an important consideration every time we review a power supply because it facilitates constant voltage levels despite varying loads. Tight load regulation also, among other factors, improves the system’s stability, especially under overclocked conditions and, at the same time, it applies less stress to the DC-DC converters that many system components utilize.

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XPG Pylon 650

(Image credit: Tom's Hardware)

Results 1-8: Load Regulation

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XPG Pylon 650

(Image credit: Tom's Hardware)
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XPG Pylon 650

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XPG Pylon 650

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XPG Pylon 650

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XPG Pylon 650

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XPG Pylon 650

(Image credit: Tom's Hardware)
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XPG Pylon 650

(Image credit: Tom's Hardware)

Load regulation is satisfactory at 12V and pretty tight at 5V and 3.3V. 

Hold-Up Time

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.

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XPG Pylon 650

(Image credit: Tom's Hardware)

Results 9-12: Hold-Up Time

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XPG Pylon 650

(Image credit: Tom's Hardware)
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XPG Pylon 650

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XPG Pylon 650

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XPG Pylon 650

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XPG Pylon 650

(Image credit: Tom's Hardware)
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XPG Pylon 650

(Image credit: Tom's Hardware)

Despite the large bulk cap for this platform still, the hold-up time cannot reach 17ms. The power ok signal is accurate, at least. 

Inrush Current

Inrush current, or switch-on surge, refers to the maximum, instantaneous input current drawn by an electrical device when it is first turned on. A large enough inrush current can trip circuit breakers and fuses. It can also damage switches, relays and bridge rectifiers. As a result, the lower the inrush current of a PSU right as it is turned on, the better.

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XPG Pylon 650

(Image credit: Tom's Hardware)

Results 13-14: Inrush Current

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XPG Pylon 650

(Image credit: Tom's Hardware)

The inrush current is low with both voltage inputs. 

Leakage Current

In layman's terms, leakage current is the unwanted transfer of energy from one circuit to another. In power supplies, it is the current flowing from the primary side to the ground or the chassis, which in the majority of cases is connected to the ground. For measuring leakage current, we use a GW Instek GPT-9904 electrical safety tester instrument.

The leakage current test is conducted at 110% of the DUT's rated voltage input (so for a 230-240V device, we should conduct the test with 253-264V input). The maximum acceptable limit of a leakage current is 3.5 mA and it is defined by the IEC-60950-1 regulation, ensuring that the current is low and will not harm anyone coming in contact with the power supply's chassis.

XPG Pylon 650

(Image credit: Tom's Hardware)

Higher leakage current than the other PSUs in the chart, but still way lower than 3.5 mA. 

10-110% Load Tests

These tests reveal the PSU's load regulation and efficiency levels under high ambient temperatures. They also show how the fan speed profile behaves under increased operating temperatures.

Test #12V5V3.3V5VSBDC/AC (Watts)EfficiencyFan Speed (RPM)PSU Noise (dB[A])Temps (In/Out)PF/AC Volts
13.556A1.983A1.983A0.988A64.95083.894%87221.834.69°C0.956
12.193V5.044V3.324V5.058V77.41938.96°C115.16V
28.137A2.976A2.981A1.189A130.00687.405%87621.735.60°C0.976
12.179V5.042V3.321V5.046V148.73940.54°C115.15V
313.065A3.473A3.480A1.390A195.00288.319%88122.036.42°C0.984
12.166V5.040V3.319V5.035V220.79441.84°C115.15V
418.004A3.970A3.980A1.592A260.00388.182%88422.536.60°C0.987
12.153V5.038V3.317V5.024V294.84843.29°C115.15V
522.613A4.966A4.979A1.796A325.03387.709%88823.137.30°C0.990
12.140V5.036V3.314V5.013V370.58245.07°C115.15V
627.173A5.959A5.978A2.000A389.27986.930%89222.938.33°C0.991
12.125V5.036V3.312V4.999V447.80746.96°C115.15V
731.826A6.955A6.979A2.205A454.59485.935%109128.038.98°C0.992
12.112V5.035V3.310V4.988V529.00047.97°C115.14V
836.486A7.953A7.980A2.411A519.85284.823%146636.439.59°C0.993
12.099V5.032V3.307V4.976V612.87049.50°C115.14V
941.540A8.452A8.469A2.412A584.61084.084%162538.739.63°C0.993
12.088V5.027V3.305V4.973V695.27050.15°C115.12V
1046.571A8.951A8.990A2.519A649.38482.656%234346.540.06°C0.994
12.072V5.027V3.302V4.961V785.64751.82°C115.11V
1151.998A8.955A8.997A2.522A714.22881.467%234346.540.19°C0.994
12.059V5.025V3.300V4.954V876.70352.89°C115.10V
CL10.116A12.996A12.996A0.000A110.03380.722%90322.837.77°C0.974
12.176V5.043V3.315V5.056V136.31145.99°C115.15V
CL253.980A1.001A1.000A1.000A665.15683.185%222346.140.88°C0.994
12.075V5.032V3.309V5.001V799.60952.46°C115.10V

We pushed the PSU up to 40 degrees Celsius, and it didn't sweat, even during the overload test. Efficiency takes a big hit, though, during the full load and overload tests, with the cooling fan spinning at full speed to cope with the thermal load. Another note here is the good performance of the APFC converter. 

20-80W Load Tests

In the following tests, we measure the PSU's efficiency at loads significantly lower than 10% of its maximum capacity (the lowest load the 80 PLUS standard measures). This is important for representing when a PC is idle with power-saving features turned on.

Test #12V5V3.3V5VSBDC/AC (Watts)EfficiencyFan Speed (RPM)PSU Noise (dB[A])PF/AC Volts
11.215A0.495A0.497A0.197A19.97971.543%86622.00.882
12.202V5.048V3.328V5.080V27.926115.15V
22.432A0.991A0.993A0.394A39.96880.347%86422.10.936
12.198V5.046V3.326V5.074V49.744115.15V
33.654A1.486A1.488A0.592A60.00083.610%86721.90.953
12.194V5.044V3.325V5.068V71.762115.15V
44.869A1.983A1.985A0.790A79.95185.653%87221.80.966
12.190V5.044V3.324V5.061V93.343115.15V

The efficiency levels under light loads are high enough. 

2% or 10W Load Test

Intel plans on raising the ante at efficiency levels under ultra-light loads. So from July 2020, the ATX spec will require 70% and higher efficiency with 115V input. The applied load is only 10W for PSUs with 500W and lower capacities, while for stronger units we dial 2% of their max-rated-capacity.

Test #12V5V3.3V5VSBDC/AC (Watts)EfficiencyFan Speed (RPM)PSU Noise (dB[A])PF/AC Volts
10.911A0.224A0.222A0.042A13.20165.084%85621.60.837
12.204V5.047V3.330V5.087V20.283115.15V

It is very tough for any Bronze or Silver (in the Cybenetics scale) to break the 70% efficiency barrier with such a light load. 

Efficiency & Power Factor

Next, we plotted a chart showing the PSU's efficiency at low loads, and loads from 10 to 110% of its maximum rated capacity. The higher a PSU’s efficiency, the less energy goes wasted, leading to a reduced carbon footprint and lower electricity bills. The same goes for Power Factor.

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XPG Pylon 650

(Image credit: Tom's Hardware)

Results 15-18: Efficiency

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XPG Pylon 650

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XPG Pylon 650

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XPG Pylon 650

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XPG Pylon 650

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XPG Pylon 650

(Image credit: Tom's Hardware)

This is an efficient platform for this category's standards, with very good performance under light loads. 

5VSB Efficiency

Test #5VSBDC/AC (Watts)EfficiencyPF/AC Volts
10.100A0.50977.948%0.069
5.088V0.653115.16V
20.250A1.27080.482%0.151
5.085V1.578115.16V
30.550A2.79280.998%0.260
5.078V3.447115.17V
41.000A5.06981.705%0.340
5.069V6.204115.17V
51.500A7.58779.379%0.387
5.058V9.558115.17V
62.499A12.59176.995%0.432
5.038V16.353115.17V
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XPG Pylon 650

(Image credit: Tom's Hardware)

Results 19-20: 5VSB Efficiency

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XPG Pylon 650

(Image credit: Tom's Hardware)

The 5VSB rail is highly efficient. 

Power Consumption In Idle And Standby

Mode12V5V3.3V5VSBWattsPF/AC Volts
Idle12.207V5.046V3.330V5.089V4.4100.418
115.2V
Standby0.0420.004
115.2V
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XPG Pylon 650

(Image credit: Tom's Hardware)

Results 21-22: Vampire Power

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XPG Pylon 650

(Image credit: Tom's Hardware)

Vampire power is kept low. 

Fan RPM, Delta Temperature, And Output Noise

All results are obtained between an ambient temperature of 37 to 47 degrees Celsius (98.6 to 116.6 degrees Fahrenheit).

(Image credit: Tom's Hardware)

(Image credit: Tom's Hardware)

PSU's fan spins at low speeds up to around 400W loads, even under high operating temperatures. With higher loads and high ambient temperatures, it quickly increases its RPM. 

The following results were obtained at 30 to 32 degrees Celsius (86 to 89.6 degrees Fahrenheit) ambient temperature.       

(Image credit: Tom's Hardware)

(Image credit: Tom's Hardware)

The fan's noise is low at up to 400W loads under normal operating temperatures, and it exceeds 40 dBA with higher than 490W loads.

MORE: Best Power Supplies

MORE: How We Test Power Supplies

MORE: All Power Supply Content

Aris Mpitziopoulos
Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.
  • maxamillionfeettall
    Nice! So both the 750w and 650w units have the elite secondary caps. Makes me wonder what the 550w version has since the 450w version uses capxon.

    The FDB fan is a big plus, kudos for that.
    Reply