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Dell PowerEdge M905

System Memory – PowerEdge M905
You can upgrade your system memory to a maximum of 192 GB by installing up to twenty-four 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.

General Memory Module Installation Guidelines – PowerEdge M905
To ensure optimal performance of your system, observe the following guidelines when configuring your system memory:
• Memory modules must be installed in pairs, beginning with the first two sockets in each set of memory modules. These sockets are marked by white retention levers.
• All memory modules in the blade must be identical in speed and technology. The memory modules in each pair must be the same size.
• If pairs of memory modules of different sizes are installed, the larger capacity memory modules must be installed in the lower numbered slots.
• Memory sparing is supported if 24 memory modules are installed. (Memory mirroring is not supported.)

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.