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Figure 4-7: Recommended Circuit Diagram for I_PSU% signal inside PSU
4.3.7.1 PCIe* CEM Gen 5 Power Excursions and I_PSU% (Required)
Section 3.1 of this document details peak power requirements for a power supply.
When a power supply includes I_PSU%, the peak power requirements are less for all
time criteria except the short time and highest level. This reduction in peak power
requirements creates a significant benefit to use the I_PSU% feature in a desktop
system. This is because the power supply is reporting the system consumption back to
the system and the power management control of the processor can react to it
quickly. Based on the power budgets in
Table 3-2 and peak power of both the
Processor detailed in Table 2-1 and the PCIe* Add-In-Card in Section 3.1, the
following Peak Power Requirements are defined for a Power Supply that includes
I_PSU%. These Peak Power requirements are different based on its rated output
power and inclusion of the 12VHPWR connector to lower the impact of these peak
power requirements in smaller power supplies or power supplies without the 12VHPWR
connector. The PCIe* Power Excursions defined in Section
3.1 will have the biggest
impact on a power supply when it includes a 12VHPWR connector. See Table 4-12 for
details.
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