Dell External OEMR R410 Owners Manual - Page 120

• For Memory Mirroring or Advanced ECC Mode, the two sockets furthest from the processor are unused and memory modules are installed beginning with socket A1 or B1 and proceeding with socket 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 will operate at the speed of the slowest installed memory module(s). Mode-Specific Guidelines Three memory channels are allocated to each processor. The number of channels used and the allowable configurations depend on the memory mode selected. Advanced ECC (Lockstep) Mode Support In this configuration, the two channels closest to the processor are combined to form one 128-bit channel. This mode supports Single Device Data Correction (SDDC) for both x4- and x8-based memory modules. Memory modules must be identical in size, speed, and technology in corresponding slots. 120 Installing System Components