ASROCK EPC621D8A User Manual page 46

Enhanced Halt State(C1E)
Enable Enhanced Halt State (C1E) for lower power consumption.
Hardware P-States
Disable: Hardware chooses a P-state based on OS Request (Legacy P-States)
Native Mode: Hardware chooses a P-state based on OS guidance
Out of Band Mode: Hardware autonomously chooses a P-state (no OS guidance)
AES-NI
Use this item to enable or disable AES-NI support.
CPU Thermal Throttling
Enable CPU internal thermal control mechanisms to keep the CPU from overheating.
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