NEC 1080Xd User Manual page 18

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Ten fan modules are located throughout the system. Any fan module can easily
be removed and installed, without powering down the system.
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Optional PCIX Unit in two versions, Base Unit and Core Unit:
See Appendix A, "Technical Specifications," for a list of system specifications.
1-4 System Overview
14 PCI-X expansion slots in a Base Unit model
12 PCI-X expansion slots, a Basic I/O Board with 2 USB, 2 IDE, and
1 Keyboard interfaces, a VGA card with an analog interface, and a
DVD-ROM unit in a Core Unit model to allow a second bootable partition.
Bay for an optional DAT or optional USB FDD unit
Six hot-swap SCSI hard disk drive bays for up to 6 hard drives.