Manufacturer: DELL
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R640 NVME Cable A0/B0 0684MR
This cable provides PCIe connectivity for NVME drives on the R640 10 Bay server. It connects from the backplane on ports A0/B0, routes along the left side of the chassis and terminates at the M3/M4 connectors in the rear. It enables NVME support for last 4 drive bays.
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R640 Air Shroud/Baffle 0F37N2
This is the air shroud/baffle specific to the R640 server. Its purpose is to direct the air from the fans to critical components. Many shrouds also have the DIMM slots printed on them.
Installation:

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R640 NVME Cable A1/B1 0TXC4H
These cables supply PCIe connectivity for NVME drives on the R640 10 Bay server. They enable NVME on drive bays 2 – 5. One end connects to the backplane on ports A1/B1. The other end terminates at the rear of the chassis on ports M1/M2.