Question ASPM Settings in Asus BIOS ?

[steve489]

My new Asus Z790 board has various settings for ASPM currently disabled by default. Is there any advantage in enabling them for a desktop PC only have a NVidia GPU in the main PCIe slot:

Here are the settings currently disabled:

PCI Express Native Power Management

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
Set this item to [Enabled] for OS Controlled ASPM, or set this item to [Disabled] for BIOS controlled ASPM. Configuration options: [Auto] [Enabled] [Disabled]

PCH - PCI Express

DMI Link ASPM Control
Allows you to control the Active State Power Management of the DMI Link. Configuration options: [Disabled] [L1] [Auto]

ASPM
Allows you to select the ASPM state for energy-saving conditions. Configuration options: [Disabled] [L1] [Auto]

L1 Substates
Allows you to select the PCI Express L1 Substates settings. Configuration options: [Disabled] [L1.1] [L1.1 & L1.2]

SA - PCI Express

DMI ASPM
Allows you to set the DMI ASPM Support. Configuration options: [Disabled] [Auto] [ASPM L0s] [ASPM L1] [ASPM L0sL1]

DMI Gen3 ASPM
Allows you to set the DMI Gen3 ASPM Support. Configuration options: [Disabled] [Auto] [ASPM L0s] [ASPM L1] [ASPM L0sL1]

PEG - ASPM
Allows you to control the ASPM support for the PEG 0. This has no effect if PEG is not the currently active device. Configuration options: [Disabled] [L0s] [L1] [L0sL1]

PCI Express Clock Gating
Allows you to enable or disable PCI Express Clock Gating for each root port. Configuration options: [Disabled] [Enabled]

 

[helpstar]

the advantage would be a little reduction of power consumption
disadvantage would be higher latency of the devices in the PCIe slots