Power supply ratings explained: the 80 Plus certification system in detail

The 80 Plus rating system is entirely voluntary and not required for any company to release a power supply. Some of the best power supply brands will adhere to its independent testing to achieve verification on the easy-to-understand ranking system in good faith as it’s a good shorthand for a consumer to know it’s a quality product.

It’s common (if not always ensured) that just about any PSUs made by Be Quiet, Corsair, Cooler Master, Enermax, Fractal Design, Gigabyte, Lian-Li, MSI, NZXT, Seasonic, SilverStone, among others, will adhere to it.

The latest published FAQ PDF document for 80 Plus testing from July 2024 goes into more detail about how power supplies are benched and the decisions made that culminate in a final rating.

This includes details on the measuring of the input voltage with C19 and C14 open connectors, as well as the frequencies at which the units are tested. This includes outlines for non-redundant tests at 50V and internal redundant tests at 60Hz with varying voltages accordingly, depending on whether it’s in the EU (230V) or North America (230V and 277/480V).

We also know the power source used for PSU testing, it’s an Amtek MX45-3PI-480-HV 3-phase 45 kVA solid stage voltage source used to test at 115V and 230V. A Chroma 61845 3-phase 45 kVA voltage source is used in testing 277V, 480V, and 380VDC. These are run through a power analyzer, the Yokogawa WT3000E, with varying settings and samples for input and output parameters.

CLEAResult also explained that it starts its testing protocols with a 0% load and then begins recording each operating load for 15 minutes. The process is repeated at 10%, 20%, 50%, and 100%. Should a PSU fail for any reason, the test is terminated, and a second unit is benched from the original point of failure. If it passes then the data is used for the report, but if it fails, the PSU line will not receive certification.

Based on the thorough nature of the testing, combined with the transparency of the process from CLEAResult, it’s apparent that only PSUs of a certain quality will meet the standards to become 80 Plus certified. We recommend thoroughly reading through the 19-page document for full clarification.

Given everything, we’re confident in recommending a minimum of an 80 Plus Bronze PSU, however, an 80 Plus Gold or 80 Plus Platinum brick will offer the highest level of efficiency for the money. 99.9% of computer users will not need an 80 Plus Titanium power brick, but it couldn’t hurt if you’re eyeing up a high-performance model.