Dell PowerEdge C4140 EMC Installation and Service Manual - Page 76

Table 32. Memory channels Processo Channel 0 r Channel 1 Processor Slots A1 and A7 Slots A2 and A8 1 Processor Slots B1 and B7 Slots B2 and B8 2 Channel 2 Slots A3 and A9 Slots B3 and B9 Channel 3 Channel 4 Slots A4 and A10 Slots A5 and A11 Slots B4 and B10 Slots B5 and B11 Channel 5 Slots A6 and A12 Slots B6 and B12 Table 33. Memory population Processor DIMM type DIMM Ranking SkyLake RDIMM 1R/2R RDIMM 4R/8R CascadeLake RDIMM 1R RDIMM 2R LRDIMM 4R/8R Capacity Voltage 8 GB, 16 GB, 32 GB 1.2 V 64 GB, 128 GB 1.2 V 8 GB 1.2 V 16 GB, 32 Gb, 64 GB 1.2 V 64 GB, 128 Gb 1.2 V Maximum Speed (1 DIMM per channel) 2666 2666 2666 2933 2666 Maximum Speed (2 DIMM per channel) 2666 2666 2666 2666 2666 General memory module installation guidelines To ensure optimal performance of your system, observe the following general guidelines when configuring your system memory. If your system's memory configurations fail to observe these guidelines, your system might not boot, stop responding during memory configuration, or operate with reduced memory. The memory bus may operate at frequency can be 2933 MT/s, 2666 MT/s, 2400 MT/s, or 2133 MT/s depending on the following factors: • System profile selected (for example, Performance Optimized, or Custom [can be run at high speed or lower]) • Maximum supported DIMM speed of the processors. For memory frequency of 2933 MT/s, one DIMM per channel is supported. • Maximum supported DIMM speed of the processors. • Maximum supported speed of the DIMMs NOTE: MT/s indicates DIMM speed in MegaTransfers per second. The system supports Flexible Memory Configuration, enabling the system to be configured and run in any valid chipset architectural configuration. The following are the recommended guidelines for installing memory modules: • All DIMMs must be DDR4. • RDIMMs and LRDIMMs must not be mixed. • x4 and x8 DRAM based memory modules can be mixed. • Up to two RDIMMs can be populated per channel regardless of rank count. • Up to two LRDIMMs can be populated per channel regardless of rank count. • A maximum of two different ranked DIMMs can be populated in a channel regardless of rank count. • If memory modules with different speeds are installed, they will operate at the speed of the slowest installed memory module(s). • Populate memory module sockets only if a processor is installed. ○ For dual-processor systems, sockets A1 to A12 and sockets B1 to B12 are available. • Populate all the sockets with white release tabs first, followed by the black release tabs. • When mixing memory modules with different capacities, populate the sockets with memory modules with the highest capacity first. For example, if you want to mix 8 GB and 16 GB memory modules, populate 16 GB memory modules in the sockets with white release tabs and 8 GB memory modules in the sockets with black release tabs. • Memory modules of different capacities can be mixed provided other memory population rules are followed. For example, 8 GB and 16 GB memory modules can be mixed. • In a dual-processor configuration, the memory configuration for each processor must be identical. For example, if you populate socket A1 for processor 1, then populate socket B1 for processor 2, and so on. • Mixing of more than two memory module capacities in a system is not supported. 76 PowerEdge C4140 installing and removing system components