Memory Configurations; Table 8. Dimms Supported - Dell PowerEdge R420 Technical Manual

The R420 supports the DIMMs listed in Table 8. For the latest information on supported memory,
visit Dell.com.
Capacity Speed
(GB) (MT/s)
2 1600
4 1600
2 1333
2 1600
4 1333
4 1333
4 1600
8 1333
8 1600
16 1333
16 1600
32 1333

Memory configurations

Flexible memory configurations are supported on the R420, ranging from capacities of 2GB to
384GB. The system supports up to 6 DIMMs per processor (up to 12 DIMMs in a 2- processor
configuration). The R420 has 3 memory channels per processor, with each channel supporting up
to 2 DIMMs.
The R420 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 R420:
•
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
Manual
on Support.Dell.com/Manuals.
18 PowerEdge R420 Technical Guide
Table 8. DIMMs supported
Ranks per
Type
DIMM
UDIMM 1
RDIMM 2
RDIMM 1
RDIMM 1
RDIMM 2
RDIMM 1
RDIMM 2
RDIMM 2
RDIMM 2
RDIMM 2
RDIMM 2
RDIMM 4
Data
SDDC support
width
x8 Advanced ECC
x8 Advanced ECC
x8 Advanced ECC
X8 Advanced ECC
x8 Advanced ECC
x4 All modes
x8 Advanced ECC
x4 All modes
x4 All modes
x4 All modes
x4 All modes
x4 All modes
Dell PowerEdge R420 Systems Owner's
Voltage
1.35
1.35
1,35
1.35
1.35
1.35
1.35
1.35
1.35
1.35
1.35
1.35