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a: When CPU1 and CPU2 use x8 signals, the socket-direct function is supported.
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The B/D/F (Bus/Device/Function Number) is the default value when the server is fully
configured with PCIe cards. The value may differ if the server is not fully configured
with PCIe cards or if a PCIe card with a PCI bridge is configured.
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Root Port (B/D/F) indicates the B/D/F of an internal PCIe root port of the processor.
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Device (B/D/F) indicates the B/D/F (bus address displayed on the OS) of an onboard or
extended PCIe device.
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The PCIe x16 slots are compatible with PCIe x16, PCIe x8, PCIe x4, and PCIe x1 cards.
The PCIe cards are not forward compatible. That is, the PCIe slot width cannot be
smaller than the PCIe card link width.
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The full-height half-length (FHHL) PCIe slots are compatible with FHHL PCIe cards
and half-height half-length (HHHL) PCIe cards.
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