Chapter 4: BIOS
85
Patrol Scrub
Patrol Scrubbing is a process that allows the CPU to correct correctable memory errors
detected on a memory module and send the correction to the requestor (the original
source). When this item is set to Enable, the IO hub reads and writes back one cache
line every 16K cycles if there is no delay caused by internal processing. By using this
method, roughly 64 GB of memory behind the IO hub is scrubbed every day. The op-
tions are Disabled, Enabled, and Enable at End of POST.
IIO Conguration
CPU1 Conguration
IOU0/1/3/4 (IIO PCIe Port 1/2/4/5)
Use this feature to congure the PCIe port Bifurcation setting for PCIe port. The
options are Auto, x4x4x4x4, x4x4x8, x8x4x4, x8x8, and x16.
*For detailed slot bifurcation mapping, refer to the system block diagram in
chapter 1.
NVME0/NVME1/NVME2/NVME3
Link Speed
Use this feature to select the link speed for the PCIe port. The options are Auto,
Gen 1 (2.5 GT/s), Gen 2 (5 GT/s), Gen 3 (8 GT/s), and Gen 4 (16 GT/s).
The following information is displayed:
• PCIe Port Link Status
• PCIe Port Link Max
• PCIe Port Link Speed
PCIe Port Max Payload Size
Selecting Auto for this feature enables the motherboard to automatically detect
the maximum Transaction Layer Packet (TLP) size for the connected PCIe device,
allowing for maximum I/O eciency. Selecting 128B or 256B designates maximum
packet size of 128 or 256. The options are 128B, 256B, 512B, and Auto.
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