User`s guide

9-26 Upgrading Your Server
IMPORTANT:
 If CPU2 is not installed, CPU2_DIMM1 through CPU2_DIMM6 are not available.
 If additional 8 GB memory boards are installed, be sure to install DIMMs starting from the
smallest socket number.
NOTE: Memory mirroring and LockStep (x8 SDDC) features are optional. Contact your service
representative for details. For configuration, see "Using the Memory RAS Features" described
later.
The factory-installed two 1-GB DIMMs and additional 1-GB memory board is unavailable for x4
SDDC feature. To use x4 SDDC feature, an additional 2-GB/4-GB/8-GB memory board is
required.