Asus ROG STRIX Z490-E - Platform Misc Configuration; PCI Express Native Power Management; PCH - PCI Express; ASPM

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ROG STRIX Z490-E BIOS Manual
6.1 Platform Misc Configuration
The items in this menu allow you to configure the platform-related features.
PCI Express Native Power Management
This item allows you to enhance the power saving feature of PCI Express and perform
ASPM operations in the operating system.
Configuration options: [Disabled] [Enabled]
The following item appears only when PCI Express Native Power Management is set to
[Enabled].
Native ASPM
Configuration options: [Auto] [Enabled] [Disabled]
PCH - PCI Express
DMI Link ASPM Control
This item allows you to control the Active State Power Management of the DMI Link.
Configuration options: [Disabled] [L0s] [L1] [L0sL1] [Auto]
ASPM
This item allows you to select the ASPM state for energy-saving conditions.
Configuration options: [Disabled] [L0s] [L1] [L0sL1] [Auto]
L1 Substates
This item allows you to select the PCI Express L1 Substates settings.
Configuration options: [Disabled] [L1.1] [L1.1 & L1.2]
PCI Express Clock Gating
This item allows you to enable or disable PCI Express Clock Gating for each root port.
Configuration options: [Disabled] [Enabled]