Dell PowerEdge M630 Owner's Manual

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65• Memory modules must be identical in size, speed, and technology.• DIMMs installed in memorysockets with white release levers must be identical and the same rule applies for sockets with blackrelease levers. This ensures that identical DIMMs are installed in matched pair —for example, A1 with A2, A3 with A4, A5 with A6,and so on.Memory optimized (independent channel) modeThis mode supports Single Device Data Correction (SDDC) only for memory modules that usex4 device width. It does not imposeany specific slot population requirements.Memory sparingNOTE: Touse memory sparing, this feature must be enabled in System Setup.In this mode, onerank per channel is reserved as aspare. If persistent correctable errors are detected onarank, the data from thisrank iscopied to the spare rank, and the failed rank is disabled.With memory sparing enabled, the system memory available to the operating system is reduced byonerank per channel. Forexample, in a dual-processor configuration with sixteen 4 GB single-rank memory modules, the available system memory is: 3/4(ranks/channel) × 16 (memory modules) × 4 GB = 48 GB, and not 16 (memory modules) × 4 GB = 64 GB.NOTE: Memory sparing does not offer protection against a multi-bit uncorrectable error.NOTE: Both Advanced ECC/Lockstepand Optimizermodessupportmemorysparing.Memory mirroringMemory mirroring offers the strongest memory module reliability mode compared to all other modes, providing improveduncorrectable multi-bit failure protection. In amirrored configuration, the total available system memory is one half of the totalinstalled physical memory. Half of the installed memory is used to mirror the active memory modules. In the event of anuncorrectable error,the system switches over to the mirrored copy.This ensures SDDC and multi-bit protection.The installation guidelines for memory modules are as follows:• Memory modules must be identical in size, speed, and technology.• Memorymodulesinstalledinmemorymodulesockets with whitereleaseleversmustbeidenticalandthesameruleappliesforsockets with black and green release tabs. This ensures that identical memory modules are installed in matched pairs—forexample, A1 with A2, A3 with A4, A5 with A6, and so on.Table 23. Processor configurationProcessor Configuration Memory population rules Memory population informationSingle CPU Memory population order {1,2}, {3,4} See Memory mirroring noteSample memory configurationsThe following tables show sample memory configurations that follow the appropriate memory guidelines stated in this section.NOTE: 1R, 2R, and 4R in the following tables indicate single-, dual-, and quad-rank DIMMs respectively.NOTE: When using an 86 mm wide heat sink for single processor, the memory module sockets A10 and A12 are notavailable for population.Table 24. Memory configurations – single processorSystem Capacity (inGB) DIMM Size (inGB) Number ofDIMMs Organization andSpeedDIMM Slot Population16 4 4 1R x8, 2133 MT/s1R x8, 2400 MT/sA1, A2, A3, A4