Name: Intel ATX 3.0
Brand: Intel
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Document Number: 336521

ATX Version 3.0 Multi Rail

Desktop Platform Power Supply

Design Guide

Revision 2.0

February 2022

Table of Contents3
Introduction13
Alternative Low Power Mode for Power Supplies13
Reference Documentation13
Terminology15
Table 1-1: Conventions and Terminology15
Table 1-2: Support Terminology16
Processor Configurations17
Processor Configurations - RECOMMENDED17
High End Desktop Market Processor Considerations17
Table 2-1: 12V2 Current for Processor Configurations17
Modular Power Supply Connectors18
Overclocking Recommendations19
PCI Express* Add-In Card Considerations20
Pcie* Add-In Card Power Excursions20
Table 3-1: PCI Express* CEM Add-In Card Power Excursion Limits Table21
Pcie* Add-In Card and PSU Power Budgets22
Figure 3-1: PCI Express* CEM Add-In Card Power Excursion Limits Chart22
Table 3-2: Pcie* AIC and PSU Power Budget Used for Peak Power Excursion Test Cases23
PSU Power Excursion24
Table 3-3: Pcie* AIC and PSU Power Budget Used for Peak Power Excursion24
Pcie* AIC Auxiliary Power Connectors25
Figure 3-2: Duty Cycle Definition25
Table 3-4: Duty Cycle Example Test Criteria for a 1000W PSU - RMS25
Pcie* Add-In Card Auxiliary Power Connectors Sideband Signals26
Table 3-5: Auxiliary Power Connectors Power Supply Rail Requirements - +12V Only26
Sense1 / Sense0 (Required)27
CARD_PWR_STABLE (Optional)27
Table 3-6: PCI Express* 12VHPWR Connector Power Limits27
CARD_CBL_PRES# (Optional)28
Sideband Signals DC Specifications (Required)29
Table 3-7: PCI Express* 12VHPWR Connector - Sideband Signal DC Specifications29
Electrical30
AC Input - REQUIRED30
Input over Current Protection - REQUIRED30
Inrush Current - REQUIRED30
Input under Voltage - REQUIRED30
Table 4-1: AC Input Line Requirements30
DC Output - REQUIRED31
DC Voltage Regulation - REQUIRED31
DC Output Current - REQUIRED31
Table 4-2: DC Output Voltage Regulation31
Table 4-3: DC Output Transient Step Sizes31
Table 4-4: DC Output Transient Slew Rate32
Remote Sensing - RECOMMENDED33
Other Low Power System Requirements33
Output Ripple Noise - REQUIRED33
Table 4-5: Recommended Standby Rail DC and AC Power Efficiency33
Capacitive Load - RECOMMENDED34
Figure 4-1: Differential Noise Test Setup34
Table 4-6: DC Output Noise/Ripple34
Table 4-7: Output Capacitive Loads34
Closed Loop Stability - REQUIRED35
+5V DC / +3.3V DC Power Sequencing - REQUIRED35
Figure 4-2: Power Supply Timing35
Voltage Hold-Up Time - REQUIRED36
12V2 DC Minimum Loading - REQUIRED36
Timing, Housekeeping and Control - REQUIRED36
Figure 4-3: Power on Timing36
Table 4-8: 12V2 DC Minimum Current36
Pwr_Ok - Required37
Table 4-9: Power Supply Timing37
Power-Up Cross Loading Condition - REQUIRED38
Ps_On# - Required38
Table 4-10: PWR_OK Signal Characteristics38
Table 4-11: PS_ON# Signal Characteristics38
5Vsb - Required39
Figure 4-4: PS_ON# Signal Characteristics39
Power-On Time - REQUIRED40
Rise Time - REQUIRED40
Figure 4-5 +5VSB Power on Timing Versus VAC40
Overshoot at Turn-On / Turn-Off - REQUIRED41
Reset after Shutdown41
5VSB at Power-Down - REQUIRED41
Figure 4-6: Rise Time Characteristics41
5VSB Fall Time - RECOMMENDATION42
Output Protection42
Over Voltage Protection (OVP) - REQUIRED42
Figure 4-7: 5VSB Fall Time42
Table 4-12: over Voltage Protection42
Short Circuit Protection (SCP) - REQUIRED43
Load Situation - REQUIRED43
Over Current Protection (OCP) - REQUIRED43
Over Temperature Protection (OTP) - REQUIRED43
Output Bypass - REQUIRED43
Separate Current Limit for 12V2 - OPTIONAL43
Overall Power Supply Efficiency Levels44
Table 4-13: Efficiency Versus Load Minimum Requirements44
Table 4-14: Low Load Efficiency Requirements44
Power Supply Efficiency for Energy Regulations - ENERGY STAR* and CEC (California Energy Commission) PC Computers with High Expandability Score - RECOMMENDED45
Table 4-15: Efficiency Versus Load for ENERGY STAR45
Table 4-16: Efficiency Versus Load for CEC PC Computers with High Expandability Computers45
Mechanical47
Labeling and Marking - RECOMMENDED47
Figure 5-1: 12VHPWR Connector Labeling Example47
Connectors - REQUIRED48
AC Connector48
DC Connectors48
Figure 5-2: Connectors (Pin-Side View, Not to Scale)48
Table 5-1: Main Power Connector Pin-Out48
Main Power Connector - REQUIRED49
Peripheral Connectors49
Floppy Drive Connector - Do Not Include (for Historical Reference Only)50
PCI-Express* (Pcie*) Add-In Card Connectors (Recommended)50
Table 5-2: Peripheral Connector Pin-Out50
Table 5-3: Floppy Connector Pin-Out50
Table 5-4: Pcie* 2X3 Auxiliary Power Connector Pin Assignment (75 Watts)51
Table 5-5: Pcie* 2X4 Auxiliary Power Connector Pin Assignment (150 Watts)52
Table 5-6: Pcie* 2X4 Auxiliary Power Connector Sense Pin Decoding by AIC52
Figure 5-3: 12VHPWR Cable Plug Connector53
Figure 5-4: 12VHPWR Cable Assembly54
+12 V Power Connector55
Table 5-7: Pcie* 12VHPWR Auxiliary Power Connector Pin Assignment (600 Watts)55
Table 5-8: +12 V Power 4 Pin Connector Pin-Out55
Serial ATA* Connectors - REQUIRED56
Table 5-9: +12 V Power 8 Pin Connector Pin-Out56
Table 5-10: Serial ATA* Power Connector Pin-Out56
Airflow and Fans - RECOMMENDED57
Fan Location and Direction57
Fan Size and Speed57
Figure 5-5: Serial ATA* Power Connector57
Venting58
Acoustics59
Acoustics - RECOMMENDED59
Table 6-1: Recommended Power Supply Acoustic Targets59
Environmental60
Temperature - RECOMMENDED60
Thermal Shock (Shipping) - RECOMMENDED60
Humidity - RECOMMENDED60
Altitude - RECOMMENDED60
Mechanical Shock - RECOMMENDED60
Random Vibration - RECOMMENDED61
Electromagnetic Compatibility62
Emissions - REQUIRED62
Immunity - REQUIRED62
Input Line Current Harmonic Content - OPTIONAL62
Magnetic Leakage Field - REQUIRED62
Table 8-1: EMC Requirement by Country62
Voltage Fluctuations and Flicker - REQUIRED63
Safety64
North America - REQUIRED64
International - REQUIRED64
Proscribed Materials - REQUIRED65
Catastrophic Failure Protection - RECOMMENDED65
Reliability66
Reliability - RECOMMENDED66
Reliability - PS_ON# Toggle for S0Ix Mode - REQUIRED66
CFX12V Specific Guidelines 2.067
Physical Dimensions - REQUIRED67
Figure 11-1: CFX12V Mechanical Outline67
LFX12V Specific Guidelines 2.068
Physical Dimensions - REQUIRED68
Figure 12-1: LFX 12V Mechanical Outline68
Figure 12-2: Mechanical Details69
Figure 12-3: PSU Slot Feature Detail70
Figure 12-4: Recommended Chassis Tab Feature71
ATX12V Specific Guidelines 3.072
Figure 13-1: Power Supply Dimensions for Chassis that Does Not Require Top Venting72
Figure 13-2: Power Supply Dimensions for Chassis that Require Top Venting73
SFX12V Specific Guidelines 4.074
Lower Profile Package - Physical Dimensions - REQUIRED74
Fan Requirements - REQUIRED74
Figure 14-1: 40 MM Profile Mechanical Outline75
Figure 14-2: Chassis Cutout75
Top Fan Mount Package - Physical Dimensions -REQUIRED76
Fan Requirements - REQUIRED76
Figure 14-3: Top Mount Fan Profile Mechanical Outline77
Reduced Depth Top Mount Fan - Physical78
Fan Requirements - REQUIRED78
Figure 14-4: Chassis Cutout78
Figure 14-5: Recessed Fan Mounting78
Figure 14-6: Reduced Depth Top Mount Fan Profile Mechanical Outline79
Figure 14-7: Chassis Cutout79
Standard SFX Profile Package - Physical Dimensions - REQUIRED80
Fan Requirements - REQUIRED80
Figure 14-8: 60 MM Mechanical Outline80
PS3 Form Factor-Physical Dimensions - REQUIRED81
Fan Requirements - REQUIRED81
Figure 14-9: Chassis Cutout81
Figure 14-10: PS3 Mechanical Outline82
TFX12V Specific Guidelines 3.083
Physical Dimensions - REQUIRED83
Figure 15-1: Mechanical Outline83
Figure 15-2: Dimensions and Recommended Feature Placements (Not to Scale)84
Mounting Options - RECOMMENDED85
Figure 15-3: Power Supply Mounting Slot Detail85
Chassis Requirements - RECOMMENDED86
Figure 15-4: Fan Right and Fan Left Orientations of Power Supply in a Chassis86
Figure 15-5: Suggested TFX12V Chassis Cutout86
Figure 15-6: Suggested Mounting Tab (Chassis Feature)87
Flex ATX Specific Guidelines 2.088
Physical Dimensions - REQUIRED88
Figure 16-1: Mechanical Outline88
Figure 16-2: Dimensions and Recommended Feature Placements (Not to Scale)89

Brand	Intel
Model	ATX 3.0
Category	Computer Hardware
Language	English

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