Oracle Server X8-2 has four PCIe slots, one of which can only accommodate an internal host bus adaptor (HBA) card. Oracle Server X8-2L has eleven PCIe slots, and an additional twelfth nonstandard slot. These slots can contain cards installed at the factory, or ordered from Oracle and installed on site. All PCIe cards must be of a type supported for your server.
Some PCIe cards require configuration, either when you install the server, or when you add or change them. Review the server product notes for a complete list of supported PCIe cards:
Supported PCIe Cards in Oracle Server X8-2 Product Notes
Oracle Server X8-2 - https://www.oracle.com/goto/x8-2/docs
Supported PCIe Cards in Oracle Server X8-2L Product Notes
Oracle Server X8-2L - https://www.oracle.com/goto/x8-2l/docs