NEC Express5800/120Rh-2 N8100-1061F User Manual page 306

9-32 Upgrading Your Server
If a bootable PCI board (e.g., a disk array controller, SCSI controller, or LAN card) is
additionally installed, the boot priority is changed to the default. After the additional
installation, start the BIOS SETUP utility, select [Boot] → [Boot Device Priority], and set
the new boot priority.
If an option operating with only 33 MHz is installed in one of the slots (1C, 2C, and 3C,
or 1B, 2B, and 3B) on a PCI riser card, the options installed in the other slots of the same
riser card are subjected to operation with only 33 MHz.
Contact your service representative for the acceptable optional PCI board.