• Memory modules must be identical in size, speed, and technology.• Memory modules installed in memory module sockets with white release levers must be identical andthe same rule applies for sockets with black and green release tabs. This ensures that identicalmemory modules are installed in matched pairs—for example, A1 with A3, A2 with A4, A5 with A7, andso on.Fault Resilient MemoryFault Resilient Memory (FRM) mode operates with the parts of redundant system memory, leaving the restof the system memory in non-mirror mode. It reduces the cost of memory mirroring by mirroring just thecritical portion of memory versus mirroring the entire memory space. It provides additional flexibility tooptimize cost, performance, or RAS by providing high degree of reliability to memory at lower cost thanmirroring the entire system memory.Memory Mirroring is a RAS feature that enables duplicating memory content at a remote DIMM in thepartition. This capability enables high data availability from memory subsystem. Fault Resilient Memoryenables you to select the segments of system memory that contains the most critical code.Sample memory configurationsThe following table shows sample memory configurations for a single processor that follow theappropriate memory guidelines stated in this section.NOTE: DIMMs populated must be identical for each riser. In the mirroring mode, only one of thetwo CPUs is populated.Table 2. Memory configurations—single riserMemoryMode SystemCapacity (inGB)DIMMSize (inGB)Number ofDIMMs DIMM Slot Population for CPU 1 ( Riser Aand B)AdvancedECCLockstep2 6 10 4 8 12 1 5 9 3 7 1164 8 8 X X X X96 8 12 X X X X X X128 8 16 X X X X X X X X192 8 24 X X X X X X X X X X X X64 16 4 X X X X96 16 6 X X X X X X128 16 8 X X X X X X X X128 32 4 X X X X192 32 6 X X X X X X256 32 8 X X X X X X X X384 32 12 X X X X X X X X X X X XOptimizedPopulation32 8 4 X X X X48 8 6 X X X61
