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Dell PowerEdge M820 Systems Manuel technique
Table 7 lists the DIMMs that are supported on the M820. For the latest information on supported
memory, visit Dell.com/PowerEdge.
Only
Capacity
(GB)
2
2
4
4
4
4
8
8
8
16
16
32
32

Memory configurations

The M820 server supports flexible memory configurations ranging from capacities of 4GB to 1.5TB,
and up to 12 DIMMs per processor (up to 48 DIMMs in a four-processor configuration). Each
processor has four memory channels, with each channel supporting up to three DIMMs.
Flexible memory configuration
The M820 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: RDIMM or LRDIMM. These types
cannot be mixed.
The following additional memory population guidelines apply to the M820:
Up to two quad-rank (QR) DIMMs and up to three dual-rank (DR) or single-rank (SR) DIMMs may
be populated per channel. Although an LRDIMM is physically a QR DIMM, logic on the LRDIMM
can make it appear as a DR DIMM to the system, allowing up to three LDRIMMs 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
PowerEdge M820 Technical Guide
18
Table 7.
DIMMs supported
Ranks
Speed
Type
(MT/s)
DIMM
1600
RDIMM
1333
RDIMM
1333
RDIMM
1600
RDIMM
1333
RDIMM
1333
RDIMM
1333
RDIMM
1333
RDIMM
1600
RDIMM
1600
RDIMM
1333
RDIMM
1333
LRDIMM
1333
RDIMM
on Dell.com/Support/Manuals.
Data
per
SDDC support
width
1
x8
Advanced ECC
1
x8
Advanced ECC
2
x8
Advanced ECC
2
x8
Advanced ECC
1
x4
All modes
2
x8
Advanced ECC
2
x4
All modes
2
x4
All modes
2
x4
All modes
2
x4
All modes
2
x4
All modes
4
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
1.35
1.35
Dell PowerEdge M820