Pcie* Add-In Card Auxiliary Power Connectors Sideband Signals; Table 3-5: Auxiliary Power Connectors Power Supply Rail Requirements - +12V Only - Intel ATX 3.0 Design Manual

tolerance required to the PCIe* Add-in Card at both the motherboard edge card
connector and Auxiliary Power connectors. Each Auxiliary Power Connector must have
voltage pins that belong to the same +12V power converter, if multiple voltage rails
exist from the PSU.

Table 3-5: Auxiliary Power Connectors Power Supply Rail Requirements - +12V Only

+12V Power Rail
Characteristic
Sustained Power
Voltage Range
NOTES:
3.3 PCIe* Add-in Card Auxiliary Power Connectors
Sideband Signals
The new 12VHPWR connector has 4 sideband signals defined that communicate
between the Power Supply and the PCIe* Card. Two of these sideband signals are
required with the connector and two of them are optional from the Power Supply. The
four sideband signals are:
• SENSE0
• SENSE1
• CARD_PWR_STABLE
• CARD_CBL_PRES#
For the most up to date and detailed description, refer to
Sideband Signal in the PCI Express* Card Electromechanical Specification,
Revision 5.0. That document is available from www.pcisig.com.
26
2, 4, 5
+ 12 V
Current 3, 4, 5
(Max RMS)
1. The maximum current slew rate for the 12VHPWR connector interface shall be no
more than 5.0 A/µs.
2. Maximum sustained power is an average power in any continuous 1 second interval
3. Maximum of root-mean-square (RMS) of current in any continuous 1 second
interval
4. The main reference limit is the maximum allowed sustained power per connector
and Add-in Card type. Add-in Card and System must concurrently comply with all
power and voltage and current requirements in this table for the applicable
connector and other requirements in this specification for the Add-in Card type.
5. Maximum instantaneous and other excursions exceeding these limits are defined in
Section 3.1 of this document.
2x3 Connector
75 Watts
+5% / -8%
6.75 Amps
PCI Express* Add-in
Card Considerations
2x4 Connector
150 Watts
+5% / -8%
13.5 Amps
Section 5.3 – Optional
12VHPWR
Connector
600 Watts
+5% / -8%
1
55 Amps
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