Load Regulation, Hold-Up Time & 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.
Neither the hold-up time nor the power-good signal satisfy the ATX spec's requirements. At least the power-good signal is accurate. You should avoid any PSU that reports this signal falsely; it'll apply a lot of stress to your system's components any time power is lost.
For details on our inrush current testing, please click here.
For such a high-capacity PSU, the inrush current is pretty low with both voltage inputs.
Load Regulation And Efficiency Measurements
The first set of tests reveals the stability of the voltage rails and the KL-C1500PL's efficiency. The applied load equals (approximately) 10 to 110 percent of the PSU's maximum load 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 compatible with Intel's C6/C7 sleep states 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||PSU Noise||Temps (In/Out)||PF/AC Volts|
|1||10.486A||1.969A||1.984A||0.983A||149.517||87.838%||0 RPM||<6.0 dB(A)||44.64°C||0.977|
|2||22.065A||2.961A||2.988A||1.183A||299.648||90.432%||1155 RPM||31.8 dB(A)||38.57°C||0.981|
|3||34.012A||3.461A||3.481A||1.384A||449.611||91.215%||1390 RPM||36.8 dB(A)||39.13°C||0.988|
|4||45.957A||3.963A||4.007A||1.587A||599.661||92.144%||1442 RPM||38.1 dB(A)||39.37°C||0.980|
|5||57.635A||4.964A||5.030A||1.792A||749.841||91.721%||1843 RPM||43.3 dB(A)||39.88°C||0.982|
|6||69.327A||5.971A||6.060A||1.998A||899.916||91.214%||2160 RPM||46.9 dB(A)||40.98°C||0.986|
|7||81.029A||6.981A||7.096A||2.205A||1050.045||90.695%||2310 RPM||49.5 dB(A)||42.16°C||0.990|
|8||92.650A||7.997A||8.139A||2.415A||1200.222||89.948%||2310 RPM||49.5 dB(A)||43.53°C||0.992|
|9||104.572A||8.511A||8.657A||2.419A||1349.925||89.407%||2320 RPM||49.5 dB(A)||45.86°C||0.993|
|10||116.182A||9.028A||9.212A||3.047A||1499.936||88.691%||2320 RPM||49.5 dB(A)||46.02°C||0.994|
|11||128.320A||9.040A||9.229A||3.051A||1649.822||88.167%||2320 RPM||49.5 dB(A)||47.61°C||0.995|
|CL1||0.735A||14.002A||13.997A||0.000A||125.184||81.838%||2290 RPM||49.4 dB(A)||44.10°C||0.979|
|CL2||125.006A||1.000A||0.998A||1.000A||1533.121||88.672%||2320 RPM||49.5 dB(A)||46.73°C||0.995|
Load regulation on the +12V rail is tight enough, it's decent at 5V, and fairly mediocre on the 3.3V and 5VSB rails. The 5VSB rail registers the worst performance with close to 4% deviation. Fortunately, load regulation on that rail doesn't matter much so long as the voltage levels stay within spec.
This PSU's efficiency meets the 80 PLUS Platinum requirements with 20% load, and it comes pretty close with 50% and full load, even at the very high ambient temperatures we use during our measurements. Clearly, the platform is resilient to heat; it delivers more than its full power at close to 48°C. You'll simply have to tolerate a super-noisy fan. Enhance tunes its speed profile aggressively to keep air moving through the internals. But for a PSU mostly aimed at miners, this is logical.
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