Dell PowerEdge M910 - Manual (Page 184)

184 Installing Blade Components
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 M905
Memory sparing (spare bank) is supported in systems that have one of the
memory configurations shown in Table 3-5. 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.
System Memory – PowerEdge M805
You can upgrade your system memory to a maximum of 128 GB by installing
667 MHz registered DDR2 memory modules in sets of 1 GB, 2 GB, 4 GB, or
8 GB memory modules. (Dual-rank 8 GB modules are supported; quad-rank
8 GB modules are not supported.) Each processor has four memory channels,
organized in sets of two channels.
NOTE: If more than four memory modules are installed per processor, the memory
modules are downclocked to operate at 533 MHz.
Table 3-5. Memory Sparing Configurations – PowerEdge M905
NOTE: Memory sparing is supported if 24 identical memory modules are installed.
Total
System
Memory Usable
System
Memory Memory Modules -
Number and Size Memory Module Locations
48 GB 40 GB Twenty-four 2 GB A1, A2, A3, A4, A5, A6, A7, A8, B1, B2,
B3, B4, B5, B6, B7, B8, C1, C2, C3, C4,
D1, D2, D3, D4
96 GB 80 GB Twenty-four 4 GB
192 GB 160 GB Twenty-four 8 GB