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.
Primary Rails And 5VSB Load Regulation
Load Regulation testing is detailed here.
Our hold-up time tests are described in detail here.
The hold-up time doesn't manage to meet the ATX spec's requirements. With such a low-capacity bulk cap, this didn't come as a surprise. In fact, we expected even less hold-up time.
For details on our inrush current testing, please click here.
The inrush current that this medium-capacity PSU registered is the highest among all PSUs we have tested so far. It's a design flaw and should be fixed immediately.
Load Regulation And Efficiency Measurements
The first set of tests reveals the stability of the voltage rails and the PSU's efficiency. The applied load equals (approximately) 10 to 110 percent of the supply's maximum 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 0.10A. 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 (A/V)||5V(A/V)||3.3V(A/V)||5VSB(A/V)||PowerDC/AC(W)||Efficiency (%)||Fan Speed(RPM)||Fan NoisedB(A)||TempIn/Out(°C)||PF/AC (V)|
Load regulation on the +12V and 5V rails is average. At 5VSB, it's good for the standards of this rail, while at 3.3V it was nothing less than amazing. In the efficiency section, the PSU achieves lower results than the 80 PLUS Bronze requirements, but we will give it a pass since we conducted our tests at a much higher ambient temperature. As a result, it's natural to measure lower efficiency.
Speaking of high operating temperatures, the VPF650 didn't have a problem delivering its full power continuously at up to 46 °C (114.8 °F), but its cooler was extremely noisy under these conditions. The 120mm fan rotates at full speed once the PSU is seriously stressed, outputting an annoying noise level that reaches 60 dB(A).