PassMark PM123 - Power Sequencing Requirements; PSU Efficiency Standards Explained

Inline PSU Tester – User’s Guide Page 10
Power sequencing
The +12 VDC and +5 VDC output levels must always be equal to or greater than the
+3.3 output during power-up and normal operation. The time between the +12VDC or
+5VDC output reaching its minimum in-regulation level and +3.3VDC reaching its
minimum in-regulation level must be ≤ 20 ms. The PSU Tester checks the timing
sequencing and report it as “T SEQ”.
Efficiency
80 Plus (trademarked 80 PLUS) is a voluntary certification program intended to
promote efficient energy use in computer power supply units (PSUs). It certifies
products that have more than 80% energy efficiency at 20%, 50% and 100% of rated
load, and a power factor of 0.9 or greater at 100% load. Such PSUs waste 20% or less
electric energy as heat at the specified load levels, reducing electricity use and bills
compared to less efficient PSUs.
80 Plus test type
[4]
115 V internal non-
redundant
230 V internal redundant
230 V EU internal non-
redundant
Percentage of rated
load
10%
20%
50%
100%
10%
20%
50%
100%
10%
20%
50%
100%
80 Plus
80%
80%
80%
82%
85%
82%
80 Plus Bronze
82%
85%
82%
81%
85%
81%
85%
88%
85%
80 Plus Silver
85%
88%
85%
85%
89%
85%
87%
90%
87%
80 Plus Gold
87%
90%
87%
88%
92%
88%
90%
92%
89%
80 Plus Platinum
90%
92%
89%
90%
94%
91%
92%
94%
90%
80 Plus Titanium
90%
92%
94%
90%
90%
94%
96%
91%
90%
94%
96%
94%
Table 9: Efficiency level certifications