Fujitsu D3320 PRIMERGY BX2560 M2, Reference Manual

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BX2560 M2
D3320 - BIOS Setup Utility 21
Advanced menu
3GB
The memory hole has a size of 3 GB. The remaining 1 GB address
space, below the 4G address boundary is available for DRAM.
Typically this selection is only used with 32-bit operating systems
and PCI adapter cards, which consume a huge amount of PCI
address space.
I
The PCI address decoding of 32-bit operating systems is limited
by the 4GB address boundary, even if the available PCI devices
would also support 64-bit address decoding.
SR-IOV Support
If the system has SR-IOV capable PCIe devices, this option enables or
disables Single Root IO Virtualization Support.
Disabled
Single Root IO Virtualization Support is inactive.
Enabled
Single Root IO Virtualization Support is active.