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Dell PowerEdge M420 Technisch handboek
The M420 server supports the DIMMs listed in Table 7. For the latest information on supported
memory, visit Dell.com/PowerEdge.
Capacity
(GB)
2
2
4
4
4
4
8
8
16
16
32

Memory configurations

The M420 server supports flexible memory configurations ranging from capacities of 2GB to 192GB,
and up to 3 DIMMs per processor (up to 6 DIMMs in a dual-processor configuration). Each
processor has three memory channels, with each channel supporting a single DIMM.
Flexible memory configuration
The M420 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.
The following additional memory-population guidelines also apply to the M420:
A single quad-rank (QR) DIMM, dual-rank (DR), or single-rank (SR) DIMM may be populated on
each channel.
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 speed

The M420 supports memory speeds of up to 1600MT/s, 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
PowerEdge M420 Technical Guide
19
Table 7.
Speed
Type
(MT/s)
1600
RDIMM
1600
UDIMM
1600
RDIMM
1600
RDIMM
1600
UDIMM
1600
UDIMM
1600
RDIMM
1600
RDIMM
1600
RDIMM
1333
RDIMM
1333
RDIMM
on Dell.com/Support/Manuals.
DIMMs supported
Ranks
Data
per
SDDC support
width
DIMM
1
x8
Advanced ECC
1
x8
Advanced ECC
2
x8
Advanced ECC
1
x4
All modes
2
x8
Advanced ECC
1
x8
Advanced ECC
1
x4
All modes
2
x4
All modes
2
x4
All modes
2
x4
All modes
4
x4
All modes
Voltage
1.35
1.35
1.35
1.35
1.35
1.35
1.35
1.35
1.35
1.35
1.35
Dell PowerEdge M420