108 Installing Blade ComponentsNon-Optimal Memory ConfigurationsSystem performance can be affected if your memory configuration does notconform to the preceding installation guidelines. Your system may issue anerror message during startup stating that your memory configuration is non-optimal.Memory Sparing Support - PowerEdge M905Memory sparing (spare bank) is supported in systems that have one of thememory configurations shown in Table 3-2. The memory sparing feature mustalso be enabled in the Memory Information screen of the System Setupprogram. See "Memory Information Screen" on page 83. To use memorysparing, you must disable node interleaving.System Memory - PowerEdge M805You can upgrade your system memory to a maximum of 128 GB by installing667-MHz registered DDR2 memory modules in sets of 1-GB, 2-GB, 4-GB, or8-GB memory modules. (Dual-rank 8-GB modules are supported; quad-rank8-GB modules are not supported.) Each processor has four memory channels,organized in sets of two channels.NOTICE: If more than four memory modules are installed per processor, thememory modules will be downclocked to operate at 533 Mhz.Table 3-2. Memory Sparing Configurations - PowerEdge M905TotalSystemMemoryUsableSystemMemoryMemory Modules -Number and SizeMemory Module Locations16 GB 12 GB Eight 2 GB A1, A2, B1, B2, C1, C2, D1, D232 GB 28 GB Sixteen 2 GB A1, A2, A3, A4, B1, B2, B3, B4, C1, C2,C3, C4, D1, D2, D3, D464 GB 56 GB Sixteen 4 GB A1, A2, A3, A4, B1, B2, B3, B4, C1, C2,C3, C4, D1, D2, D3, D4128 GB 112 GB Sixteen 8 GB A1, A2, A3, A4, B1, B2, B3, B4, C1, C2,C3, C4, D1, D2, D3, D4
