The Advanced ECC Support (maximum memory)
setting disables additional resiliency and provides the largest
memory capacity to the OS.
The Online Spare with Advanced ECC Support
setting requires a single group of spare modules and provides
automatic failover of degraded modules in the system while it is
The Mirrored Memory with Advanced ECC
Support option provides protection against uncorrectable memory
errors that would otherwise result in system failure. DIMM banks A
and B are mirrored by DIMM banks C and D on the same memory board.
The failed memory can be replaced while the system is running.
Mirrored DIMM pairs must be the same size
to allow selection of single-board mirrored memory or dual-board
mirrored memory. Pairing different size DIMMs results in the
memory configuration does not support Online Spare.