I'll let you read the article, but basically it tests PSUs at hundreds of different load level combinations, not just the 4 80 Plus uses,
Cybenetics Offers New PSU Efficiency Certification
| ETA Level | AVG Efficiency | PF | 5VSB Efficiency | Vampire Power |
|---|---|---|---|---|
| A+ | 94% to 97% | >=0.985 | >79% | <0.10W |
| A | 91% to 94% | >=0.98 | >77% | <0.15W |
| B | 98% to 91% | >=0.97 | >75% | <0.20W |
| C | 85% to 88% | >=0.96 | >73% | <0.23W |
| D | 82% to 88% | >=0.95 | >71% | <0.25W |
| LAMBDA Level | Requirements |
|---|---|
| A++ | < 20 dB(A) |
| A+ | 20 dB(A) to 25 dB(A) |
| A | 25 dB(A) to 30 dB(A) |
| B | 30 dB(A) to 35 dB(A) |
| C | 35 dB(A) to 40 dB(A) |
| D | 40 dB(A) to 45 dB(A) |
| E | > 45 dB(A) |
As of right now there are only 40 PSUs in the database, but none of them, even from the giants of Super Flower, Seasonic, FSP, and Enermax, have an A++ efficiency (ETA) score, even on their 80 Plus Titanium units. Each power supply tested is accompanied by a detailed report breakdown, including efficiency performance under more realistic 40°C ambient temperatures. Granted it is extremely difficult to hit all the A+ ETA requirements, but that's the point.
Cybenetics Labs – PSU Efficiency & Noise Level Certifications - Database
