Dell PowerEdge R940 EMC Installation and Service Manual - Page 99

System memory, System memory guidelines

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Figure 56. Cable routing - 24 x 2.5 inch hard drive backplane with NVMe cards 1. 24 x 2.5 inch hard drive backplane with expander board 3. PCIe cable (BP: BP PCIE B2, BP PCIE A2 to RAID controller) 5. system board 7. NVMe card (slot 8) 9. NVMe card (slot 12) 11. PCIe cable (BP: BP PCIE B0, BP PCIE A0 to RAID controller) 13. cable management bracket (right) 2. backplane power cable A (BP: BP PWR_A to MB) 4. backplane signal cable (BP: BP SIG to MB) 6. expansion card riser (left) 8. expansion card riser (right) 10. NVMe card (slot 11) 12. PCIe cable (BP: BP PCIE B1, BP PCIE A1 to RAID controller) 14. backplane power cable B (BP: BP PWR_B to MB) System memory System memory guidelines The system supports DDR4 registered DIMMs (RDIMMs), load reduced DIMMs (LRDIMMs), data center persistent memory module (DCPMM) and non-volatile dual in-line DIMM-Ns (NVDIMM-N). System memory holds the instructions that are executed by the processor. The PowerEdge R940 system (without PEM) contains 24 memory sockets split into two sets of 12 sockets, one set per processor. Each 12-socket set is organized into six channels. Six memory channels are allocated to each processor. In each channel, the release tabs of the first socket are marked white, and the second socket black. The PowerEdge R940 system (with PEM) contains 48 memory sockets split into four sets of 12 sockets, one set per processor. Each 12socket set is organized into six channels. Six memory channels are allocated to each processor. In each channel, the release tabs of the first socket are marked white, and the second socket black. Installing and removing system components 99

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Figure 56. Cable routing – 24 x 2.5 inch hard drive backplane with NVMe cards
1.
24 x 2.5 inch hard drive backplane with expander board
2.
backplane power cable A (BP: BP PWR_A to MB)
3.
PCIe cable (BP: BP PCIE B2, BP PCIE A2 to RAID controller)
4.
backplane signal cable (BP: BP SIG to MB)
5.
system board
6.
expansion card riser (left)
7.
NVMe card (slot 8)
8.
expansion card riser (right)
9.
NVMe card (slot 12)
10.
NVMe card (slot 11)
11.
PCIe cable (BP: BP PCIE B0, BP PCIE A0 to RAID controller)
12.
PCIe cable (BP: BP PCIE B1, BP PCIE A1 to RAID controller)
13.
cable management bracket (right)
14.
backplane power cable B (BP: BP PWR_B to MB)
System memory
System memory guidelines
The system supports DDR4 registered DIMMs (RDIMMs), load reduced DIMMs (LRDIMMs), data center persistent memory module
(DCPMM) and non-volatile dual in-line DIMM-Ns (NVDIMM-N). System memory holds the instructions that are executed by the
processor.
The PowerEdge R940 system (without PEM) contains 24 memory sockets split into two sets of 12 sockets, one set per processor. Each
12-socket set is organized into six channels. Six memory channels are allocated to each processor. In each channel, the release tabs of the
first socket are marked white, and the second socket black.
The PowerEdge R940 system (with PEM) contains 48 memory sockets split into four sets of 12 sockets, one set per processor. Each 12-
socket set is organized into six channels. Six memory channels are allocated to each processor. In each channel, the release tabs of the
first socket are marked white, and the second socket black.
Installing and removing system components
99