Memory Configurations; Memory Speed; Table 9. Dimms Supported - Dell PowerEdge R620 Technical Manual

Table 9 lists the DIMMs supported by the R620. For the latest information on supported memory,
visit Dell.com/PowerEdge.
Capacity
(GB)
4
4
4
8
8
16
16
32
32
32

Memory configurations

The R620 server supports flexible memory configurations ranging from capacities of 4GB to 768GB.
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. 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, see the
Dell.com/Support/Manuals.

Memory speed

The R620 supports memory speeds of up to 1866MT/s, depending on the DIMM types installed and
the configuration. The loading within a channel significantly affects memory speed.
20 PowerEdge R620 Technical Guide
Table 9.
Speed
Type
(MT/s)
1866 RDIMM
1600 RDIMM
1600 UDIMM
1866 RDIMM
1600 RDIMM
1866 RDIMM
1600 RDIMM
1866 LRDIMM
1600 LRDIMM
1333 RDIMM
DIMMs supported
Ranks
Data
per SDDC support
width
DIMM
1 X8 Advanced ECC
1 x8 Advanced ECC
1 X8 Advanced ECC
1 x4 All modes
1 x4 All modes
2 x4 All modes
2 x4 All modes
4 x4 All modes
4 x4 All modes
4 x4 All modes
Dell PowerEdge R620 Owner's Manual
Voltage
1.5
1.35
1.35
1.5
1.35
1.5
1.35
1.5
1.35
1.35
on