DDR3 1066MHZ=PC3-8500. DDR3 1333MHZ=PC3-10600. DDR3 1600MHZ=PC3-12800. ModelCrucial DDR3 4GB 8GB 1066MHZ 1333MHZ 1600MHZ NB 1.5V. The SPD interface on the CPU-Z can be checked. Total Capacity4GB 8GB 16GB 32GB.
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