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This feature disables PCIe 2.0 support. If disabled, all PCIe devices in the system operate at PCIe 1.0 speeds (2.5 Gb/s) even if a PCIe device is capable of operating at 2.0 speeds (5.0 Gb/s). This feature can be used to reduce system power usage. In addition, this feature can be used to work around issues with devices that claim PCIe 2.0 support but do not adhere to the PCIe 2.0 specification.
