Dell PowerEdge M420 Hardware Owner's Manual - Page 165

• 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.) Table 3-3 shows examples of supported memory configurations. CAUTION: Memory module blanks must be installed in unoccupied memory sockets to maintain proper cooling airflow. Table 3-3. Examples of PowerEdge M905 Memory Configurations Total System Memory Memory Modules Number and Size Memory Module Locations 8 GB Eight 1 GB A1, A2, B1, B2, C1, C2, D1, D2 16 GB Sixteen 1 GB A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3, C4, D1, D2, D3, D4 16 GB Eight 2 GB A1, A2, B1, B2, C1, C2, D1, D2 32 GB Eight 4 GB A1, A2, B1, B2, C1, C2, D1, D2 32 GB Sixteen 2 GB A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3, C4, D1, D2, D3, D4 48 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 64 GB* Eight 8 GB A1, A2, B1, B2, C1, C2, D1, D2 64 GB* Sixteen 4 GB A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3, C4, D1, D2, D3, D4 96 GB Twenty-four 4 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 128 GB Sixteen 8 GB A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3, C4, D1, D2, D3, D4 192 GB Twenty-four 8 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 *If 64 GB of memory is installed, the system recognizes only 63.75 GB during POST. Installing Blade Components 165