Chapter 3, 8 network stack network stack [disable link, Ipv4 pxe support [enable – Asus P8Z77 WS User Manual
Page 100: Ipv6 pxe support [enable, Power on by pcie/pci [disabled, Power on by ring [disabled, Power on by rtc [disabled

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Chapter 3: BIOS setup
Chapter 3
3.5.8
Network Stack
Network Stack [Disable Link]
This item allows user to disable or enable the UEFI network stack.
Configuration options: [Disable Link] [Enabled]
The following items appears only when you set the Network Stack to [Enabled].
Ipv4 PXE Support [Enable]
This item allows user to disable or enable the Ipv4 PXE Support.
Configuration options: [Disable Link] [Enabled]
Ipv6 PXE Support [Enable]
This item allows user to disable or enable the Ipv6 PXE Support.
Configuration options: [Disable Link] [Enabled]
Power On By PCIE/PCI [Disabled]
[Disabled]
Disables the PCIE devices to generate a wake event.
[Enabled]
Enables the PCIE devices to generate a wake event.
Power On By Ring [Disabled]
[Disabled]
Disables Ring to generate a wake event.
[Enabled]
Enables Ring to generate a wake event.
Power On By RTC [Disabled]
[Disabled]
Disables RTC to generate a wake event.
[Enabled]
When set to [Enabled], the items RTC Alarm Date (Days) and Hour/
Minute/Second will become user-configurable with set values.