Systems come with 1 or 2 processors each controlling 3 memory "channels" of 2 DIMM slots each. For best performance balance the total memory capacity equally between both CPUs. Overall memory speed is dependent upon the processor model and memory configuration: 1 DIMM per channel enables memory speed of 1333MHz; 2 DIMMs per channel reduces speed to 1066MHz; maximum speed with quad-rank DIMMs is 1066MHz with 1 DIMM per channel and 800MHz with 2 DIMMs per channel. Low-voltage DIMMs (1.35V) will only operate at 1.35V if used in models with Intel Xeon 5600 Series CPUs and not mixed with standard-voltage DIMMs (1.5V).
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