Load testing the PSU
Load Testing The PSU
Testing a power supply is definitely a challenge, and you’ll need professional load testers to check the PSU’s behavior the right way.
The first basic test is performed with a simple power supply tester. It doesn’t load the PSU more than a couple of Watts, but it helps to determine if the power supply unit is operational at all. There’s a self-check indicating if the voltages are at the proper levels. As you can see, there have been no issues with the Fractal ION+ PLATINUM unit.
The following setup was used for the remainder of the testing:
- Voltcraft VC-870 Digital Multimeter - voltage measurement (+ Fluke 97 scope meter)
- Oscilloscope - GW INSTEK GDS 3154
- DC load - original solution
- Fluke 97 Scope meter (a measurement of voltage and ripple),
- Voltcraft SL-451 decibel meter (volume measurement)
- ACUVIM-IIRF – for measuring active power (input from the socket).
- PCE Instruments PCE-DT 50 tachometer – for the measurement of the rotational speed of the fan.
Measurements are taken only using 230 V input voltage.
Efficiency
In our power supply reviews, we emulate real-world usage by creating such loads as a power-hungry, multi-GPU setup with a powerful CPU would have. Older components used to require more power, but there has been some progress in this area. In a typical setup, reaching over 500-600 Watts is a rather difficult task. Let’s take a look at the ION+’s efficiency first. Checking efficiency is actually a relatively easy thing to accomplish.
It does look great even at low loads (10% equaling 66/86 W), which is quite typical of the idle state in modern PC’s.
Maximum load
Next up is the maximum wattage that this unit can hold up before switching off.
Maximum Load |
Efficiency (in %) |
725 W (for 660W variant) |
91.2% |
930 W (for 860W variant) |
91.4% |
Efficiency looks excellent even above 100% load. 725 and 930 Watts are impressive values, but you really wouldn’t want to come close to that for long.
ErP Lot 6 Power Off wattage
We looked at the powered-off status (ErP/EuP), productivity mode (when we stress the CPUs), and finally gaming. The lower the wattage, the more efficient the PSU. It is that simple.
ErP Lot 6 Power Off |
value in Watts |
660 W variant |
0.11 |
860 W variant |
0.1 |
This is well below the 0.5 W requirement.
Ripple testing
First up is the ATX12V V2.2 specification for DC output ripple:
ATX12V Ver 2.2 Noise/Ripple Tolerance |
|
Output |
Ripple (mV p-p) |
+3.3 V |
50 |
+5 V |
50 |
+12 V |
120 |
The Fractal ION+ ION+ PLATINUM 660 W achieved the following results:
AC Ripple (mV p-p) | +3.3 V | +5 V | +12 V | |
65 W (10%) | 5 | 10 | 12 | |
160 W (25%) | 7 | 12 | 11 | |
330 W (50%) |
|
15 | 12 | |
485 W (75%) | 13 | 18 | 17 | |
|
15 | 20 | 28 |
For the 860 W variant it’s:
AC Ripple (mV p-p) | +3.3 V | +5 V | +12 V | |
85 W (10%) | 5 | 6 | 8 | |
210 W (25%) | 5 | 10 | 10 | |
435 W (50%) |
|
10 | 14 | |
640 W (75%) | 12 | 12 | 16 | |
|
16 | 15 | 18 |
The values are very well within tolerance. Even in the worst-case scenario (100% load), it is not worrying at all.