Asus Maximus IV GENE-Z/GEN3 - Manual (Page 108)

3-20 Chapter 3: BIOS setup
CPU C1E [Enabled]
[Disabled] Disables this function.
[Enabled] Enables the C1E support function. This item should be enabled in
order to enable the Enhanced Halt State.
CPU C3 Report [Enabled]
Allows you to disable or enable the CPU C3 report to OS.
CPU C6 Report [Enabled]
Allows you to disable or enable the CPU C6 report to OS.
Package C State limit [No Limit]
Allows you to set the package C state limit. Configuration options: [C6] [No Limit]
3.�.2 System Agent Configuration
Initial Graphic Adapter [PCIE]
Allows you to select the graphics controller as the primary boot device.
Configuration options: [iGPU] [PCIE]