Dell PowerEdge C6220 Hardware Owner's Manual page 77

Option
Memory Operating Voltage
(Auto default)
NUMA Support
(Enabled default)
Memory-Mapped I/O
(Auto default)
Memory Refresh Rate
(X1 default)
Description
Auto – this setting indicates the memory operating
voltage will be set automatically by the memory
initialization code and depends upon the installed
DIMM's capability and the memory configuration of
the system. This is the default setting and will set the
Memory Operating Voltage to the POR voltage.
1.5 V indicates all DIMMs in the system are operating
at 1.5 volts.
1.35 V indicates all DIMMs in the system are operating
at 1.35 volts.
1.25 V indicates all DIMMs in the system are operating
at 1.25 volts.
NOTE: BIOS will auto restrict selection if DIMM does not
support low voltage.
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.
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."
To disable or enable 2X refresh.
Installing System Components | 77