Asus Z87-PLUS - Manual (Page 112)

3-34 Chapter 3: BIOS setup
Chapter 3
3.6.6 Platform Misc Configuration
The items in this menu allow you to configure the platform-related features.
PCI Express Native Power Management [Disabled]
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 you set the PCI Express Native Power Management
to [Enabled].
Native ASPM [Disabled]
[Enabled]
Vista controls the ASPM support for the device.
[Disabled] BIOS controls the ASPM support for the device.