Page 21 - Dell PowerEdge R620 Technical Guide

Table 9 lists the DIMMs supported by the R620. For the latest information on supported memory,
visit Dell.com.

Capacity Speed Type Ranks per Data SDDC support Voltage
(GB) (MT/s) DIMM width
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 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

The R620 server supports flexible memory configurations ranging from capacities of 2GB to 768GB.
The system supports up to 12 DIMMs per processor (up to 24 DIMMs in a dual-processor
configuration). The R620 has 4 memory channels per processor, with each channel supporting up
to 3 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 PowerEdge R620 Owner’s Manual on
Support.Dell.com/Manuals.