Dell often times differentiates the metal riser cage from the actual PCB board with 2 different part numbers. Although you might find these usually come together as a single unit on the second hand market, they are indeed 2 different part numbers.
Archives: Parts
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R440 Primary Riser 0FJ4M3
This is the primary riser assembly for the Dell PowerEdge R440. The actual PCB board is a different part number but you will probably find these come together as a single unit most of the time.
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R440 Power Distribution Unit 01NV2N
This is the power distribution unit or PDU for the Dell PowerEdge R440. It connects the power supplies from the rear and distributes power to the rest of the components in the server.
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R440 8 Bay PCIe Storage Cable 0V8KW4
This is the cable that runs from the backplane to a PCIe storage controller on the Dell PowerEdge R440 8 Bay server. It has just enough length to reach the internal riser where the RAID controller usually installs.
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R440 8 Bay BP Signal Cable 013J2R
Signal cable that connects the backplane to the motherboard for the Dell PowerEdge R440 8 Bay server.