System Memory - Dell PowerEdge R740xd Installation And Service Manual

Figure 60. Installing 2 x 3.5 inch rear drive cage
Next steps
1 Install the rear drive backplane.
2 Connect all the cables to the rear drive backplane.
3 Install all the drives.
4 Follow the procedure listed in
Related link
Installing 3.5 inch drive backplane (rear)
Installing the 2.5 inch drive backplane (rear)
Installing a drive carrier

System memory

The system supports DDR4 registered DIMMs (RDIMMs), load reduced DIMMs (LRDIMMs) and non-volatile dual in-line DIMM-Ns
(NVDIMM-Ns). System memory holds the instructions that are executed by the processor.
NOTE: MT/s indicates DIMM speed in MegaTransfers per second.
Memory bus operating frequency can be 2666 MT/s, 2400 MT/s, or 2133 MT/s depending on the following factors:
• DIMM type (RDIMM or LRDIMM)
• Number of DIMMs populated per channel
• System profile selected (for example, Performance Optimized, or Custom [can be run at high speed or lower])
• Maximum supported DIMM frequency of the processors
Your system contains 24 memory sockets split into two sets of 12 sockets, one set per processor. Each 12-socket set is organized into six
channels. In each channel, the release tabs of the first socket are marked white, and the second socket black.
110 Installing and removing system components
After working inside your system.