Specifications

Table 9 lists the DIMMs supported by the R620. For the latest information on supported memory,
visit Dell.com.
Capacity
(GB)
Speed
(MT/s)
Type
Ranks per
DIMM
Data
width
SDDC support
Voltage
2
1333
RDIMM
1
x8
Advanced ECC
1.35
2
1333
UDIMM
1
x8
Advanced ECC
1.35
2
1600
RDIMM
1
x8
Advanced ECC
1.5
4
1333
RDIMM
2
x8
Advanced ECC
1.35
4
1333
RDIMM
1
x4
All modes
1.35
4
1333
UDIMM
2
x8
Advanced ECC
1.35
4
1600
RDIMM
2
x8
Advanced ECC
1.5
8
1333
RDIMM
2
x4
All modes
1.35
8
1600
RDIMM
2
x4
All modes
1.5
16
1066
RDIMM
4
x4
All modes
1.35
16
1333
RDIMM
2
x4
All modes
1.35
16
1600
RDIMM
2
x4
All modes
1.5
32
1333
LRDIMM
4
x4
All modes
1.35
32
1333
RDIMM
4
x4
All modes
1.35
Flexible memory configurations are supported on the R620, ranging from capacities of 2 GB
(minimum) to 768 GB (maximum). The system supports up to 12 DIMMs per processor (up to 24
DIMMs in a dual-processor configuration). The R620 has four memory channels per processor, with
each channel supporting up to three DIMMs.
The R620 supports a flexible memory configuration, according to these 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 apply to the R620:
 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, see the Dell PowerEdge R620 Systems Owner’s
Manual on Support.Dell.com/Manuals.