Asus RS500-E6/PS4 - Manual (Page 74)

5-16 Chapter 5: BIOS setup
A20M [Disabled]
Legacy OSes and APs may need A20M enabled.
Configuration options: [Disabled] [Enabled]
DCU Mode [32KB 8-way without ECC]
Select the mode for the Data Cache.
Configuration options: [32KB 8-way without ECC] [16KB 4-way with ECC]
DCA Prefetch Delay [32]
This programs the time delay in bus clocks from snoop to prefetch.
Configuration options: [8] [16] [32] [40] [48] [56] [64] [72] [80] [88] [96] [104] [112]
[120]
Intel(R) SpeedStep (TM) Tech [Enabled]
When set to [Disabled], the CPU runs at its default speed. When set to [Enabled],
the CPU speed is controlled by the operating system.
Configuration options: [Disabled] [Enabled]
Intel(R) C-STATE Tech [Enabled]
The Intel ® C-State Technology allows the CPU to save more power under idle
mode. Enable this item only when you install a C-State Technology-supported
CPU. Configuration options: [Disabled] [Enabled]
C3 State [ACPI C2]
Allows you to select the CPU action under C3 state.
Configuration options: [Disabled] [ACPI C2] [ACPI C3]
C6/7 State [Enabled]
Allows you to select the CPU action under C6 and C7 state.
Configuration options: [Disabled] [Enabled]
C State package limit setting [Auto]
This item appears only when you set the Intel(R) C-STATE Tech item to [Enabled].
We recommend that you set this item to [Auto] for BIOS to automatically detect the
C-State mode supported by your CPU.
Configuration options: [Auto] [C1] [C3] [C6] [C7]
C1 Auto Demotion [Enabled]
When enabled, CPU will conditionally demote C3/C6/C7 requests to C1 based on
on-core auto-demote information. Configuration options: [Disabled] [Enabled]