Note - PCIe slot 1 is nonfunctional in single-processor systems.
For instructions, see Remove a PCIe Riser From PCIe Slot 1 or 2
Caution - Whenever you remove a PCIe card, you should replace it with another PCIe card or a filler panel. Installing filler panels in vacant PCIe slots helps reduce the level of electromagnetic interference (EMI) emitted by the server. For instructions for installing a filler panel, see Removing and Installing Server Filler Panels .