Dell PowerEdge R810 - Manual (Page 2)

Low Voltage Memory Modules (DDR3L DIMMs)
Intel Xeon 5600 series processors support DDR3L DIMMs enabling a lower
operating voltage (1.35 V) that ensures memory power savings up to 20% per
DIMM. DDR3L memory is backward-compatible to Intel Xeon 5500 series and
operates at standard voltage (1.5 V) without any limitations.
Operating the system memory at a lower voltage may cause restrictions to
additional frequency and memory population capabilities. For example,
populating three memory modules per channel is not supported at 1.35 V.
Systems with 1.35 V DDR3L memory operates the memory modules at 1.5 V
if any of the following conditions exist:
• Intel Xeon 5500 series processors
• Two 1333 MHz DIMMs per channel
• A combination of both standard and low voltage memory modules
For information on the memory configuration guidelines, see your system’s
Hardware Owner’s Manual at support.dell.com/manuals.
NOTE:
BIOS setup options allow the user to control frequency and voltage
configuration within allowable limits.
New BIOS Setup Options
Memory Settings Screen
Option Description
System Memory Voltage Displays the system memory voltage.
Memory Operating Voltage
(Auto Default) Sets the system memory voltage selection.
Memory Operating Mode Displays the type of memory operation if a valid memory
configuration is installed. When set to Optimizer Mode,
the memory controllers run independent of each other for
improved memory performance. When set to Mirror Mode,
memory mirroring is enabled. When set to Advanced ECC
Mode, two controllers are joined in 128-bit mode running
multi-bit advanced ECC. The Spare Mode option is present
on systems with the Intel Xeon 5600 series processors only.