
Dell EMC PowerEdge R840 Installation and Service Manual
Drive backplane
The drive backplanes supported in PowerEdge R840 are shown here:Figure 1. 8 x 2.5-inch backplane

Figure 2. 24 x 2.5-inch (24 NVMe) backplane 
Figure 3. 2.5 inch (x24) SAS/SATA (expander) with universal slot for NVMe backplane 

- miniSAS hard drive B 1
- miniSAS hard drive A 1
- Power cable connector
- Backplane signal connector

- PCIe cable connector
- PCIe cable connector
- PCIe cable connector
- PCIe cable connector
- Backplane signal connector
- SAS/SATA cable connector
- Power cable connector
- Backplane signal connector
- Power cable connector

- SAS cable connector A
- SAS cable connector B
- Backplane signal connector(J_BP_SIG)
- Power cable connector (J_PWR_A)
- Power cable connector (J_PWR_B)
- PCIe cable connector
- PCIe cable connector
- PCIe cable connector
- PCIe cable connector
- PCIe cable connector
- PCIe cable connector
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