Dell External R720 T Technical Manual

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Dell External R720 T Technical Manual Manual pdf 24 page image

24 PowerEdge R720 and R720xd Technical GuideTable 8 lists the DIMMs supported on the R720 and R720xd. For the latest information on supportedmemory, visit Dell.com.OnlyCapacity(GB)Speed(MT/s) Type Ranks perDIMMDatawidth SDDC support Voltage2 1600 UDIMM 1 x8 Advanced ECC 1.354 1600 UDIMM 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 Advanced ECC 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 1.3532 1333 LRDIMM 4 x4 All modes 1.35The R720 and R720xd servers support flexible memory configurations ranging from capacities of2GB (minimum) to 768GB (maximum). The R720 and R720xd support up to 12 DIMMs per processor(up to 24 DIMMs in a dual-processor configuration). Each server has 4 memory channels perprocessor, with each channel supporting up to 3 DIMMs.Both systems support a flexible memory configuration, according to the following 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 is allowed per system: UDIMM, RDIMM, or LRDIMM. Thesetypes cannot be mixed.The following additional memory-population guidelines apply to the R720 and R720xd: Up to two quad-rank (QR) DIMMs and up to three dual-rank (DR) or single-rank (SR) DIMMs maybe populated per channel. Although an LRDIMM is physically a QR DIMM, logic on the LRDIMMcan 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 aremixed with SR DIMMs, DR DIMMS should be placed in the lowest DIMM slots, followed by the SRDIMMs.For more information on memory configuration and population, see theDell PowerEdge R720 andR720xd Owner’s Manual on Support.Dell.com/Manuals.