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Ursprünglicher Beitrag von: repoman27 ,

Text:

The Haswell iMacs support both "normal" 1.5 V DDR3 and "low voltage" 1.35 V DDR3L SODIMMs. In order to operate at the lower voltage level (which consumes less power and generates less heat), you must use all DDR3L modules, otherwise they will operate at 1.5 V since the memory bus can only be driven at a single voltage.

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