Dell PowerEdge M910 - Manual (Page 187)

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