ATX Version 3.0 Multi Rail Desktop Platform Power Supply

Design Guide

ID 336521
Date 01/02/2022
Version 2.0
Public
Document Table of Contents

Power Supply Efficiency for Energy Regulations - ENERGY STAR* and CEC (California Energy Commission) PC Computers with High Expandability Score - RECOMMENDED

The efficiency of the power supply should be tested at nominal input voltage of 115 VAC input and 230 VAC input, under the load conditions defined in the form factor specific sections, and under the temperature and operating conditions defined in Chapter Chapter 7. The loading condition for testing efficiency represents fully loaded systems, typical (50%) loaded systems, and light (20%) loaded systems. For systems being sold into the state of California that meet the High Expandability Computer definition (details at the referenced CEC website below) are required to meet the efficiency target list in Table 4-16: Efficiency versus Load for CEC PC Computers with High Expandability Computers*7.

Visit ENERGY STAR* Computers Ver.8 (ES v8) website for more details:

Visit CEC* website for more details:

Note:check ENERGY STAR* and CEC website for the latest specification update.

Table 4-15: Efficiency versus Load for ENERGY STAR*

Loading

Full Load

(100%)

Typical Load

(50%)

Light Load

(20%)

PFC @ 50% load

Remarks

RECOMMENDED Minimum Efficiency

82%

85%

82%

≥0.9

ES v8 for

500W and below

RECOMMENDED Minimum Efficiency

87%

90%

87%

≥0.9

ES v8 for

above 500W

Table 4-16: Efficiency versus Load for CEC PC Computers with High Expandability Computers*

Loading

Full Load

(100%)

Typical Load

(50%)

Light Load

(20%)

PFC @ 50% load

REQUIRED Minimum Efficiency for 115V PSU

87%

90%

87%

≥0.9

REQUIRED Minimum Efficiency for 230V PSU

88%

92%

88%

≥0.9

*Details about High Expandability Computers definition check CEC computer regulation.

The RECOMMENDED minimum efficiency levels shown in Table 4-15 are required for internal power supplies within the ENERGY STAR* for Computers Version 8.0 specification.