Dell PowerEdge R740xd2 EMC Installation and Service Manual - Page 93

Figure 72. System memory Memory channels are organized as follows: Table 10. Memory channels Processor Processor 1 Channel 0 Slots A1 and A7 Channel 1 Channel 2 Slots A2 and A8 Slots A3 Processor 2 Slots B1 Slots B2 Slots B3 Channel 3 Slots A4 and A9 Slots B4 Channel 4 Slots A5 and A10 Slots B5 Channel 5 Slots A6 Slots B6 Table 11. Memory population DIMM Type DIMMs Populated/ Channel RDIMM 1 2 Voltage 1.2 V Operating Frequency (in MT/s) Maximum DIMM Rank/ Channel 2666, 2400, 2133, 1866 Dual rank or single rank 2666, 2400, 2133, 1866 Dual rank or single rank 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 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. • Maximum supported speed of the DIMMs Installing and removing system components 93