Acer AR380 F1 Series User Manual page 91

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Ratio to CMOS Setting: Select Manual to manually configure the CPU
Ratio. Select Auto to allow the BIOS to automatically configure the
CPU Ratio based on the processor installed on the motherboard.
C1E Support: Select Enabled to use the feature of Enhanced Halt State.
C1E significantly reduces the CPU's power consumption by reducing
the CPU's clock cycle and voltage during a Halt State.
Important: The following feature is only available if supported by
the processor and/or operating system.
Hardware Prefetcher: If set to Enabled, the hardware prefetcher will
prefetch streams of data and instructions from the main memory to
the L2 cache in the forward or backward manner to improve CPU
performance.
Important: The following feature is only available if supported by
the processor and/or operating system.