Asus Prime Z270-A Series Bios Manual page 20

When the Ai Overclock Tuner is set to [Manual] or [XMP], the following items appear.
BCLK Frequency
This item allows you to set the BCLK (base clock) frequency to enhance the system
performance. Use the <+> or <-> to adjust the value. The values range from 40.0 MHz
to 650.0 MHz.
We recommend you to set the value based on the CPU specification, as high BCLK
frequencies may damage the CPU permanently.
ASUS MultiCore Enhancement
[Auto]
[Disabled]
AVX Instruction Core Ratio Negative Offset
This item allows you to subtract a value from your core ratio at which AVX applications run.
Configuration options: [Auto] [1] – [31]
CPU Core Ratio
This item allows you to set the CPU core ratio limit per core or synchronize automatically to
all cores.
Configuration options: [Auto] [Sync All Cores] [By Core Usage]
When the CPU Core Ratio is set to [Sync All Cores], the following item appears.
When the CPU Core Ratio is set to [By Core Usage], the following item appears.
If you assign a value for 2-Core Ratio Limit, do not set the 1-Core Ratio Limit to [Auto].
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This item allows you to maximize the oveclocking performance optimized
by ASUS core ratio settings.
This item allows you to set to default core ratio settings.
1-Core Ratio Limit
Enter [Auto] to apply the CPU default Turbo Ratio setting or manually
assign a 1-Core Limit value that must be higher than or equal to the 2-Core
Ratio Limit.
1-Core Ratio Limit
Enter [Auto] to apply the CPU default Turbo Ratio setting or manually
assign a 1-core ratio limit that must be higher than or equal to the 2-core
ratio limit.
2-Core Ratio Limit
Enter [Auto] to apply the CPU default Turbo Ratio setting or manually
assign a 2-core ratio limit that must be higher than or equal to the 3-core
ratio limit.
ASUS PRIME Z270-A/AR Series BIOS Manual