Dell PowerEdge R640 Manual
Also see for EMC PowerEdge R640: Installation and service manualInstallation and service manualInstallation and service manualDeployment guideHardware installation guide
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Table 7. Intel Xeon SP RDIMM/LRDIMM supportType Ranks perDIMM anddata widthDIMM capacity (GB) Speed (MT/s); Voltage (V)Slot Per Channel (SPC) and DIMM Per Channel(DPC)1 Slot PerChannel (SPC) 2 Slots Per Channel (SPC)1DPC 1DPC 2DPC4 GB 8 GB 16 GB 1.2 V 1.2 V 1.2 VRDIMM SR x 4 8 GB 16 GB 32 GB 2666 2666 2440RDIMM SR x 8 4 GB 8 GB 16 GBRDIMM DR x 8 8 GB 16 GB 32 GBRDIMM DR x 4 16 GB 32 GB 64 GBLRDIMM QR x 4 32 GB 64 GB -Memory configurationsThe PowerEdge R640 systems support flexible memory configurations ranging from capacities of 8 GB (minimum), to 1536 GB (maximum).The PowerEdge R640 supports up to 12 DIMMs per processor—up to 24 DIMMs in a dual-processor configuration. Each system has sixmemory channels per processor, with each channel supporting up to two DIMMs.Memory population guidelinesBoth systems support a flexible memory configuration, according to the following population guidelines:• Speed: If DIMMs of different speeds are mixed, all channels across all processors operate at the common frequency of the slowestDIMM.• DIMM type: Maximum two types of DIMMs allowed per system and only NVDIMM-Ns and RDIMMs are supported. RDIMM withLRDIMM and LRDIMM with NVDIMM-N cannot be mixed.• DIMMs with different data widths can be mixed. For 14G, DIMMs with x4 and x8 data widths are supported and mixing is allowed.• Can mix DIMMs with different capacities:• Population rules require the largest capacity DIMM be placed first (slot A1 populated first, then A2, and so on. The second CPUmirrors the first CPU population).• Maximum of two different capacity DIMMs allowed in a system• Can mix DIMMs with different ranks:• Maximum of two different rank DIMMs allowed in a systemFor more information on memory configuration and population, see the Dell EMC PowerEdge R640 Installation and Service Manual atDell.com/Support/Manuals.Memory RAS featuresReliability, Availability, and Serviceability (RAS) features help keep the system online and operational without significant impact toperformance. RAS can decrease data loss and crashing due to errors. RAS helps in rapid, accurate diagnosis of faults that requiresservicing.20 Memory |
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