Dell PowerEdge R810 Owner's Manual page 101

• The memory configuration for each processor must be identical for
optimal performance.
• Memory modules must be installed beginning with socket A1 or A2 for
processor 1, B1 or B2 for processor 2, and C1 or C2 for processor 3, D1 or
D2 for processor 4.
• In case of mixed-rank population, first populate the DIMM with the
highest number of ranks (in sockets with white release levers).
• If memory modules with different speeds are installed, they will operate at
the speed of the slowest installed memory module(s).
The system supports memory mirroring and memory sparing for limited
configurations. For more information, see Table 3-2 and Table 3-3. Mirroring
must be enabled in the System Setup program. In a mirrored configuration,
the total available system memory is one-half of the total installed physical
memory.
NOTE:
The system supports memory mirroring if all DIMM sockets are populated.
Installing System Components
101