Oracle X5-4 Service Manual page 214

Replace the NVMe Switch Card (FRU)
The NVMe card has four cables (0 through 3) that need to be disconnected.
3. To install the replacement card, connect the cables to the replacement NVMe
Switch card and install the card in PCIe slot 1.
The NVMe Switch card has four cables (0 through 3) that need to be connected before installing
the card in the slot.
For details on installing a card, see
214 Oracle Server X5-4 Service Manual • December 2015
"Install a PCIe Card" on page 164.