Hardware Owner's Manual

Installing Blade Components 187
Non-Optimal Memory Configurations
System performance can be affected if your memory configuration does not
conform to the preceding installation guidelines. Your system may issue an
error message during start-up stating that your memory configuration is non-
optimal.
Memory Sparing Support - PowerEdge M805
Memory sparing (spare bank) is supported in systems that have one of the
memory configurations shown in Table 3-7.
The memory sparing feature must
also be enabled in the Memory Information screen of the System Setup
program. See "Memory Settings Screen
" on page 140 . To use memory sparing,
you must disable node interleaving.
64 GB* Eight 8 GB A1, A2, A3, A4, B1, B2, B3, B4
128 GB Sixteen 8 GB A1, A2, A3, A4, A5, A6, A7, A8, B1, B2, B3,
B4, B5, B6, B7, B8
*If 64 GB of memory is installed, the system recognizes only 63.75 GB during POST.
Table 3-7. Memory Sparing Configurations – PowerEdge M805
NOTE: Memory sparing is supported if 16 identical memory modules are installed.
Total
System
Memory
Usable
System
Memory
Memory Modules -
Number and Size
Memory Module Locations
32 GB 28 GB Sixteen 2 GB A1, A2, A3, A4, A5, A6, A7, A8, B1, B2,
B3, B4, B5, B6, B7, B8
64 GB 56 GB Sixteen 4 GB A1, A2, A3, A4, A5, A6, A7, A8, B1, B2,
B3, B4, B5, B6, B7, B8
128 GB 112 GB Sixteen 8 GB A1, A2, A3, A4, A5, A6, A7, A8, B1, B2,
B3, B4, B5, B6, B7, B8
Table 3-6. Examples of PowerEdge M805 Memory Configurations
(continued)
Total
System
Memory
Memory Modules -
Number and Size
Memory Module Locations