IBM System x3800 Installation Manual page 40

Some options have device drivers that you must install. See the documentation that
comes with each option for information about installing device drivers.
If more than one microprocessor is installed, the server can operate as a symmetric
multiprocessing (SMP) server. You might have to upgrade the operating system to
support SMP. For more information, see the section about using the ServerGuide
Setup and Installation CD in the User's Guide on the IBM System x Documentation
CD and the operating-system documentation.
If the server has an optional RAID adapter and you have installed or removed a
hard disk drive, see the documentation that comes with the RAID adapter for
information about reconfiguring the disk arrays.
For information about configuring the integrated Gigabit Ethernet controller, see the
User's Guide on the IBM System x Documentation CD.
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IBM System x3800 Type 8866: Installation Guide