23 PowerEdge T620 Technical Guide
Table 9 lists the DIMMs supported by the T620. For the latest information on supported memory,
visit the PowerEdge memory page on Dell.com.
Table 9. DIMMs supported
Memory configurations
Flexible memory configurations are supported on the T620, ranging from capacities of 2GB
(minimum) to 768GB (maximum). The system supports up to 12 DIMMs per processor (up to
24 DIMMs in a dual-processor configuration). The T620 has four memory channels per processor,
with each channel supporting up to three DIMMs.
The T620 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 T620:
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 T620 Owner’s Manual
on
Dell.com/Support/Manuals.
Memory speed
The T620 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.
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