Memory Configurations - Dell PowerEdge M620 Technical Manual

16-DIMM capacity: uses a 97 mm heatsink to support the higher ambient temperatures of fresh

air configurations
The M620 supports a flexible memory configuration, according to the following basic rules:
Speed: If DIMMs of different speeds are mixed, all channels across all processors operate at the

slowest DIMM's common frequency.
DIMM type: Only one type of DIMM is allowed per system: UDIMM, RDIMM, or LRDIMM. These

types cannot be mixed.
The following additional memory-population guidelines also apply to the M620:
 Up to two quad-rank (QR) DIMMs and up to three dual-rank (DR) or single-rank (SR) DIMMs may
be populated per channel.
DIMMs must be installed in each channel, starting with the DIMM farthest from the processor.

 DIMMs should be installed with largest rank count to smallest. For example, if DR DIMMS are
mixed with SR DIMMs, DR DIMMS should be placed in the lowest DIMM slots, followed by the SR
DIMMs.
For more information on memory configuration and population, see the
Systems Owner's Manual
Memory speeds of 1600 MT/s, 1333 MT/s, 1066 MT/s, and 800 MT/s are supported on the M620,
depending on the DIMM types installed and the configuration. All memory on all processors and
channels run at the same speed and voltage. By default, the system runs at the highest speed for the
channel with the lowest DIMM voltage and speed. The operating speed of the memory is also
determined by the maximum speed supported by the processor, the speed settings in the BIOS, and
the operating voltage of the system.
Table 8 lists the memory configuration and performance details for the M620, based on the
population of the number and type of DIMMs per memory channel.
DIMM
DIMM 0
type
SR
DR
UDIMM
SR
SR
DR
SR
DR
QR
RDIMM
SR
SR
DR
QR
PowerEdge M620 Technical Guide
18
on Support.Dell.com/Manuals.
DIMM 1 DIMM 2
DIMMs
SR
DR
DR
SR
DR
DR
SR
Speed (MT/s)
# of
800 1066
1 ∞ ∞
1 ∞ ∞
2 ∞ ∞
2 ∞ ∞
2 ∞ ∞
1 ∞ ∞
1 ∞ ∞
1 ∞ ∞
2 ∞ ∞
2 ∞ ∞
2 ∞ ∞
2 ∞
Dell PowerEdge M620
1333 1600
∞
∞
∞
∞
∞
∞ ∞
∞ ∞
∞ ∞
∞
∞ ∞