20 PowerEdge T420 Technical Guide
The T420 supports the DIMMs listed in Table 9. For the latest information on supported memory,
visit Dell.com/PowerEdge.
Table 9. DIMMs supported
Memory configurations
The T420 supports flexible memory configurations ranging from capacities of 2GB to
384GB. The system supports up to six DIMMs per processor (up to 12 DIMMs in a two-processor
configuration). The T420 has three memory channels per processor, with each channel supporting
up to two DIMMs.
The T420 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 can be used in a system. UDIMMs and RDIMMs cannot be
mixed.
The following additional memory population guidelines apply to the T420:
Up to two quad-rank (QR), 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 T420 Systems Owner’s
Manual
on Dell.com/Support/Manuals.
Memory speed
The T420 supports memory speeds of 1600MT/s, 1333MT/s, 1066MT/s and 800MT/s depending on
the DIMM types installed and the configuration. All memory on all processors and channels run at
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