ASROCK B450D4U-V1L User Manual page 64

AMD Fan Policy
[Air Cooling] follows platform defined policy, [Water Cooling] forces PWM 100%;
Selecting [Fan Control] to [Manual] in CBS will override this option.
PcieLanes_4_7_Switch
[PT] Pcie Lanes route to PT CHIP; [CPU] Pcie Lane route to CPU PCIE.
Above 4GB MMIO Enable
Enable or disable Above 4GB MMIO.
NVMe RAID mode
Enable or disable NVMe RAID mode.
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