Dell PowerEdge C6220 II - Manual (Page 96)

96 | Using the System Setup Program
Option Description
NOTE: BIOS will auto restrict selection if DIMM does not
support low voltage.
NUMA Support
(Enabled default) Disabled – for BIOS setup to allow users enable the
node interleave option. This is for NUMA systems that
allow memory interleaving across all processor nodes.
Enabled – for BIOS setup to allow users disable the
node interleave option. This is for NUMA systems that
allows memory interleaving across all processor nodes.
Memory-Mapped I/O
(Auto default) Auto - Supports PCI-E 32-bit BAR (base address
register) in default and sets PCI-E 64-bit BAR
automatically while PowerEdge C410x or Knights
Corner GPU card are installed.
32-bit – Forced to support PCI-E 32-bit BAR.
64-bit – Forced to support PCI-E 64-bit BAR."
Memory Refresh Rate
(X1 default) To disable or enable 2X refresh.