Dell PowerEdge R420 Technical Manual

Also see for PowerEdge R420: Manual Owner's manual Owner's manual Portfolio guide Installation

Contents

Dell PowerEdge R420 Technical Manual Manual pdf 18 page image

18 PowerEdge R420 Technical GuideThe R420 supports the DIMMs listed in Table 8. For the latest information on supported memory,visit Dell.com.Table 8. DIMMs supportedCapacity(GB)Speed(MT/s) Type Ranks perDIMMDatawidth SDDC support Voltage2 1600 UDIMM 1 x8 Advanced ECC 1.354 1600 RDIMM 2 x8 Advanced ECC 1.352 1333 RDIMM 1 x8 Advanced ECC 1,352 1600 RDIMM 1 X8 Advanced ECC 1.354 1333 RDIMM 2 x8 Advanced ECC 1.354 1333 RDIMM 1 x4 All modes 1.354 1600 RDIMM 2 x8 Advanced ECC 1.358 1333 RDIMM 2 x4 All modes 1.358 1600 RDIMM 2 x4 All modes 1.3516 1333 RDIMM 2 x4 All modes 1.3516 1600 RDIMM 2 x4 All modes 1.3532 1333 RDIMM 4 x4 All modes 1.35Memory configurationsFlexible memory configurations are supported on the R420, ranging from capacities of 2GB to384GB. The system supports up to 6 DIMMs per processor (up to 12 DIMMs in a 2- processorconfiguration). The R420 has 3 memory channels per processor, with each channel supporting upto 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 theslowest DIMM’s common frequency.• DIMM type: Only one type of DIMM can be used in a system. UDIMMs and RDIMMs cannot bemixed.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 perchannel.• 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 aremixed with SR DIMMs, DR DIMMS should be placed in the lowest DIMM slots, followed by the SRDIMMs.For more information on memory configuration, see theDell PowerEdge R420 Systems Owner’sManual on Support.Dell.com/Manuals.