Sun Microsystems Enterprise 3500 System Reference Manual page 76

4.6.7 PCI Cards
Each PCI+ board can accommodate two PCI (short) cards. The PCI cards are plugged
into receptacles on corresponding riser cards that are mounted on the PCI+ I/O
board. The riser cards can be one of two voltage types, either 5.0V or 3.3V (66 MHz-
capable).
The voltage rating of a PCI card must match the rating of the riser card and
connector on the board. The PCI bus connectors of PCI cards can be one of three
possible types, those that can be used with 5.0V or 3.3V (66 MHz-capable) connector
receptacles only, and those that can be used with either voltage type.
Sun PCI+ I/O boards are shipped with two 5.0V riser cards (installed) and two 3.3V
(66 MHz-capable) riser cards (not installed). If you are switching to a 3.3V (66 MHz-
capable) PCI card, you must replace the existing 5.0V riser card with the 3.3V (66
MHz-capable) riser card. See Section 4.6.7.3 "Replacing Riser Cards" on page 4-29.
4.6.7.1 Removing a PCI Card
1. Use the procedures in Section 4.6.2 "Removing a Board," to remove the applicable
I/O+ board.
Note – Some PCI cards may not utilize the standoffs provided for mounting.
2. On the noncomponent side of the I/O+ board, loosen the locking standoff for the
corresponding PCI card that is to be removed (
4-24 Sun Enterprise 3500 System Reference Manual • August 2001
).
FIGURE 4-20