8-30 System UpgradePCI BOARDEither two or four PCI boards can be installed to the CPU/IO module.IMPORTANT: The PCI board is extremely sensitive to static electricity. Make sure to touch the metalframe of the server to discharge static electricity from your body before handling the PCIboard. Do not touch the PCI board terminals or onboard parts by a bare hand or place thePCI board directly on the desk. For more information on static electricity, see“ANTI-STATIC MEASURES” on page 8-3. Make sure to read “ANTI-STATIC MEASURES” and “PREPARING YOUR SYSTEMFOR UPGRADE.”Note the following to install or replace PCI board. Some PCI boards need to be duplexed. To make a dual PCI board configuration, install thesame type of board (i.e., having the same specifications and performance) to the same slot foreach group.When a PCI board is installed to one group, another identical PCI board should be installed tothe same slot in another group. This rule is applied to the case of removal.