Dell PowerEdge M420 Hardware Owner's Manual - Page 169

Table 3-5. Examples of PowerEdge M805 Memory Configurations (continued) Total System Memory Memory Modules Number and Size Memory Module Locations 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. 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 nonoptimal. Memory Sparing Support - PowerEdge M805 Memory sparing (spare bank) is supported in systems that have one of the memory configurations shown in Table 3-6. The memory sparing feature must also be enabled in the Memory Information screen of the System Setup program. See "Memory Settings Screen" on page 130. To use memory sparing, you must disable node interleaving. Table 3-6. Memory Sparing Configurations - PowerEdge M805 Total System Memory 32 GB Usable System Memory 28 GB Memory Modules Number and Size Sixteen 2 GB 64 GB 56 GB Sixteen 4 GB 128 GB 112 GB Sixteen 8 GB Memory Module Locations A1, A2, A3, A4, A5, A6, A7, A8, B1, B2, B3, B4, B5, B6, B7, B8 A1, A2, A3, A4, A5, A6, A7, A8, B1, B2, B3, B4, B5, B6, B7, B8 A1, A2, A3, A4, A5, A6, A7, A8, B1, B2, B3, B4, B5, B6, B7, B8 Installing Blade Components 169