Dell PowerVault NX3100 Hardware Owner's Manual - Page 83

General Memory Module Installation Guidelines To ensure optimal performance of your system, observe the following general guidelines when configuring your system memory. NOTE: Memory configurations that fail to observe these guidelines can prevent your system from starting and producing any video output. • RDIMMs and UDIMMs cannot be mixed. • Except for memory channels that are unused, all populated memory channels must have identical configurations. • The memory configuration for each processor must be identical. • Memory modules of different sizes can be mixed in A1-A4 or B1-B4 (for example, 2 GB and 4 GB), but all populated channels must have identical configurations. • For Optimizer Mode, memory modules are installed in the numeric order of the sockets beginning with A1 or B1. • For Memory Mirroring or Advanced ECC Mode, the channel furthest from the processor is unused and memory modules are installed beginning with channel A1 or B1 and proceeding with channel A2 or B2. • Advanced ECC Mode requires memory modules that use x4 or x8 DRAM device widths. • The memory speed of each channel depends on the memory configuration: - For single or dual-rank memory modules: • One memory module per channel supports up to 1333 MHz. • Two memory modules per channel supports up to 1067 MHz. - For quad-rank memory modules: • One memory module per channel supports up to 1067 MHz. • Two memory modules per channel are limited to 800 MHz, regardless of memory module speed. • If quad-rank memory modules are mixed with single- or dual-rank modules, the quad-rank modules must be installed in the sockets with the white release levers. • If memory modules with different speeds are installed, they operate at the speed of the slowest installed memory module(s). Installing System Components 83